Fla Ascend Performance
fla-org/flash-linear-attention
Guidelines for Ascend NPU kernel / Triton-Ascend backend performance work in the FLA repo.
Agent skill
Implementing Dmarc Dkim Spf Email Security
Configures SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent domain spoofing, and enforce a rejection/quarantine policy on unauthenticated mail, including auditing a…
Install Implementing Dmarc Dkim Spf Email Security
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-dmarc-dkim-spf-email-security --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/implementing-dmarc-dkim-spf-email-security .claude/skills/implementing-dmarc-dkim-spf-email-security && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "implementing-dmarc-dkim-spf-email-security" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-security into .claude/skills/implementing-dmarc-dkim-spf-email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "implementing-dmarc-dkim-spf-email-security", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-securityType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-dmarc-dkim-spf-email-security --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/implementing-dmarc-dkim-spf-email-security .agents/skills/implementing-dmarc-dkim-spf-email-security && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "implementing-dmarc-dkim-spf-email-security" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-security into .agents/skills/implementing-dmarc-dkim-spf-email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "implementing-dmarc-dkim-spf-email-security", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-dmarc-dkim-spf-email-security --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/implementing-dmarc-dkim-spf-email-security .cursor/skills/implementing-dmarc-dkim-spf-email-security && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "implementing-dmarc-dkim-spf-email-security" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-security into .cursor/skills/implementing-dmarc-dkim-spf-email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "implementing-dmarc-dkim-spf-email-security", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git --path skills/implementing-dmarc-dkim-spf-email-security--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-dmarc-dkim-spf-email-security --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/implementing-dmarc-dkim-spf-email-security .gemini/skills/implementing-dmarc-dkim-spf-email-security && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "implementing-dmarc-dkim-spf-email-security" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-security into .gemini/skills/implementing-dmarc-dkim-spf-email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "implementing-dmarc-dkim-spf-email-security", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-dmarc-dkim-spf-email-securityInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/implementing-dmarc-dkim-spf-email-security .github/skills/implementing-dmarc-dkim-spf-email-security && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "implementing-dmarc-dkim-spf-email-security" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-security into .github/skills/implementing-dmarc-dkim-spf-email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "implementing-dmarc-dkim-spf-email-security", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-dmarc-dkim-spf-email-security --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/implementing-dmarc-dkim-spf-email-security .opencode/skills/implementing-dmarc-dkim-spf-email-security && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "implementing-dmarc-dkim-spf-email-security" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/implementing-dmarc-dkim-spf-email-security into .opencode/skills/implementing-dmarc-dkim-spf-email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "implementing-dmarc-dkim-spf-email-security", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
implementing-dmarc-dkim-spf-email-security- GitHub stars
- 34k
- Token cost
- ~1.1k tokens
- SKILL.md length
- 356 words
- Files
- 8 (incl. scripts, references, assets)
- Skills in repo
- 644
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Configures SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent domain spoofing, and enforce a rejection/quarantine policy on unauthenticated mail, including auditing a…
- Works in 5 steps: Audit Current State → Implement SPF → Implement DKIM → …
- Hardening a domains email security posture
- SKILL.md covers Overview, When to Use, Prerequisites and Key Concepts, plus 3 more sections
- Runs Python scripts from its folder; calls openssl
What it does
Implementing Dmarc Dkim Spf Email Security is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configures SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent domain spoofing, and enforce a rejection/quarantine policy on unauthenticated mail, including auditing a domain's current DNS state. Use when hardening a domain's email security posture or defending against phishing and spoofing attacks.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).
It sits in Security. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.
When your agent uses it
- Hardening a domains email security posture
- Defending against phishing and spoofing attacks
Example prompts
- “s current DNS state. Use when hardening a domain”
- “Use the implementing-dmarc-dkim-spf-email-security skill to configure SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent…”
- “/implementing-dmarc-dkim-spf-email-security”
Requirements
- Python 3
Workflow steps
5 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
openssl
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
mxtoolbox.comdmarcian.compostmaster.google.comvalimail.comdmarc.postmarkapp.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Implementing Dmarc Dkim Spf Email Security loads about 1.1k tokens when it runs, and up to ~3k if it reads all its reference files. Until then it costs about 92 tokens; SKILL.md has 356 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 356 words, ~1,144 tokens.
Download SKILL.mdSave it as
.claude/skills/implementing-dmarc-dkim-spf-email-security/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.- name
- implementing-dmarc-dkim-spf-email-security
- description
- Configures SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent domain spoofing, and enforce a rejection/quarantine policy on unauthenticated mail, including auditing a domain's current DNS state. Use when hardening a domain's email security posture or defending against phishing and spoofing attacks.
- domain
- cybersecurity
- subdomain
- phishing-defense
- tags
- phishing, email-security, social-engineering, dmarc, awareness, dkim, spf, dns
- version
- 1.0
- author
- mahipal
- license
- Apache-2.0
- nist_csf
- PR.AT-01, DE.CM-09, RS.CO-02, DE.AE-02
- mitre_attack
- T1566, T1598, T1534, T1036
Implementing DMARC, DKIM, and SPF Email Security
Overview
SPF, DKIM, and DMARC form the three pillars of email authentication. Together they prevent domain spoofing, validate message integrity, and define policies for handling unauthenticated mail. Proper implementation drastically reduces phishing attacks that impersonate your organization's domain.
When to Use
- When deploying or configuring implementing dmarc dkim spf email security capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
Prerequisites
- DNS management access for your domain
- Access to email server/MTA configuration (Postfix, Exchange, Google Workspace, Microsoft 365)
- Basic understanding of DNS TXT records
- Python 3.8+ for validation scripts
Key Concepts
SPF (Sender Policy Framework)
Publishes a DNS TXT record listing authorized IP addresses and mail servers that can send email on behalf of your domain. Receiving servers check the envelope sender's IP against this list.
DKIM (DomainKeys Identified Mail)
Adds a cryptographic signature to outgoing emails using a private key. The corresponding public key is published in DNS. Receivers verify the signature to ensure the message was not altered in transit.
DMARC (Domain-based Message Authentication, Reporting and Conformance)
Builds on SPF and DKIM by specifying a policy (none/quarantine/reject) for messages that fail authentication, and provides a reporting mechanism to monitor spoofing attempts.
Show full SKILL.md (136 more words)Show less
Workflow
Step 1: Audit Current State
# Check existing SPF record
dig TXT example.com | grep spf
# Check existing DKIM selector
dig TXT selector1._domainkey.example.com
# Check existing DMARC record
dig TXT _dmarc.example.comStep 2: Implement SPF
# DNS TXT record for example.com
v=spf1 ip4:203.0.113.0/24 include:_spf.google.com include:spf.protection.outlook.com -allKey SPF mechanisms:
ip4:/ip6:- Authorize specific IP rangesinclude:- Include another domain's SPF recorda- Authorize domain's A record IPsmx- Authorize domain's MX record IPs-all- Hard fail all others (recommended)~all- Soft fail (monitoring phase)
Step 3: Implement DKIM
# Generate DKIM key pair (2048-bit RSA)
openssl genrsa -out dkim_private.pem 2048
openssl rsa -in dkim_private.pem -pubout -out dkim_public.pem
# Format public key for DNS (remove headers, join lines)
grep -v "PUBLIC KEY" dkim_public.pem | tr -d '\n'DNS TXT record at selector1._domainkey.example.com:
v=DKIM1; k=rsa; p=MIIBIjANBgkqhki...Step 4: Implement DMARC
# DNS TXT record at _dmarc.example.com
# Phase 1 (Monitor):
v=DMARC1; p=none; rua=mailto:dmarc-aggregate@example.com; ruf=mailto:dmarc-forensic@example.com; pct=100
# Phase 2 (Quarantine):
v=DMARC1; p=quarantine; rua=mailto:dmarc-aggregate@example.com; pct=25
# Phase 3 (Reject):
v=DMARC1; p=reject; rua=mailto:dmarc-aggregate@example.com; pct=100Step 5: Monitor and Analyze DMARC Reports
Use the scripts/process.py to parse DMARC aggregate XML reports and identify authentication failures, unauthorized senders, and spoofing attempts.
Tools & Resources
- MXToolbox: https://mxtoolbox.com/SuperTool.aspx
- DMARC Analyzer (dmarcian): https://dmarcian.com/
- Google Postmaster Tools: https://postmaster.google.com/
- Valimail DMARC Monitor: https://www.valimail.com/
- DMARC Report Analyzer: https://dmarc.postmarkapp.com/
Validation
- SPF record passes validation at mxtoolbox.com
- DKIM signature verified on test emails
- DMARC record properly formatted and reporting enabled
- Test emails pass all three checks in recipient's Authentication-Results header
© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 7 other files (scripts, references, assets) in skills/implementing-dmarc-dkim-spf-email-security of mukul975/Anthropic-Cybersecurity-Skills.
- SKILL.md
- LICENSE
- assets/template.md
- references/api-reference.md
- references/standards.md
- references/workflows.md
- scripts/agent.py
- scripts/process.py
Open the folder on GitHubat commit 54a7988
Compare with similar skills
Implementing Dmarc Dkim Spf Email Security next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Implementing Dmarc Dkim Spf Email Security this skillmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Fla Ascend Performancefla-org/flash-linear-attention | 5.8k | — | ~6.3k | Automated safety check: Pass | MIT | |
| Deepsec Documentation Guidevercel-labs/deepsec | 8.1k | — | ~956 | Automated safety check: Pass | Apache-2.0 | |
| Skill Scannergetsentry/skills | 1k | 4 repos | ~2.5k | Automated safety check: Warn | Apache-2.0 | |
| Serenity Aleabitoreddityan-labs/serenity-aleabitoreddit | 481 | 1 repos | ~3.3k | Automated safety check: Pass | None | |
| Security Alert Triageelastic/agent-skills | 592 | 1 repos | ~3.5k | Automated safety check: Notes | Apache-2.0 |
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Related
Categories
Questions about Implementing Dmarc Dkim Spf Email Security
What does Implementing Dmarc Dkim Spf Email Security do?
Configures SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent domain spoofing, and enforce a rejection/quarantine policy on unauthenticated mail, including auditing a…. Implementing Dmarc Dkim Spf Email Security is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configures SPF, DKIM, and DMARC DNS TXT records to authenticate outbound email, prevent domain spoofing, and enforce a rejection/quarantine policy on unauthenticated mail, including auditing a domain's current DNS state.
When should I use Implementing Dmarc Dkim Spf Email Security?
Implementing Dmarc Dkim Spf Email Security fits situations like: hardening a domains email security posture; defending against phishing and spoofing attacks.
How do I install Implementing Dmarc Dkim Spf Email Security in Claude Code?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a claude-code`. Or copy the skill folder (skills/implementing-dmarc-dkim-spf-email-security in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/implementing-dmarc-dkim-spf-email-security in your project. Claude Code loads it when a task matches its description.
How do I install Implementing Dmarc Dkim Spf Email Security in Codex?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a codex`. Or copy the skill folder (skills/implementing-dmarc-dkim-spf-email-security in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/implementing-dmarc-dkim-spf-email-security in your project. Codex loads it when a task matches its description.
Can I use Implementing Dmarc Dkim Spf Email Security in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-dmarc-dkim-spf-email-security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/implementing-dmarc-dkim-spf-email-security, .gemini/skills/implementing-dmarc-dkim-spf-email-security, .github/skills/implementing-dmarc-dkim-spf-email-security and .opencode/skills/implementing-dmarc-dkim-spf-email-security in your project.
What does Implementing Dmarc Dkim Spf Email Security need to run?
Going by SKILL.md and its folder, Implementing Dmarc Dkim Spf Email Security needs Python for the scripts in its folder and the command-line tools its instructions call (openssl). Our summary lists: Python 3.
Does Implementing Dmarc Dkim Spf Email Security access the network?
SKILL.md names 5 domains. As links in the text: mxtoolbox.com, dmarcian.com, postmaster.google.com, valimail.com and dmarc.postmarkapp.com. This is read from the text; nothing was executed.
Is Implementing Dmarc Dkim Spf Email Security safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Implementing Dmarc Dkim Spf Email Security use?
Implementing Dmarc Dkim Spf Email Security is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Implementing Dmarc Dkim Spf Email Security use?
About 1.1k tokens (SKILL.md is roughly 4.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.9k tokens, read only when the agent opens those files.
What are the alternatives to Implementing Dmarc Dkim Spf Email Security?
Skills that share tags, products or a category with Implementing Dmarc Dkim Spf Email Security: Fla Ascend Performance (fla-org/flash-linear-attention, 5.8k stars), Deepsec Documentation Guide (vercel-labs/deepsec, 8.1k stars), Skill Scanner (getsentry/skills, 1k stars) and Serenity Aleabitoreddit (yan-labs/serenity-aleabitoreddit, 481 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Implementing Dmarc Dkim Spf Email Security?
mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 33,993 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.
Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.