Comparison
AI Agent Book vs Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun
AI Agent Book has more GitHub stars (54,572 vs 0). AI Agent Book was updated more recently (last commit 1w ago). Data comes straight from GitHub and refreshes daily.
AI Agent Book
《深入理解 AI Agent：设计原理与工程实践》（李博杰 著）开源主仓库：全书正文、编译版 PDF 与按章配套代码
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git clone https://github.com/bojieli/ai-agent-book
Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun
Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark
$
claude mcp add --transport http letterkeel-send-email-via-smtp https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry| Metric | AI Agent Book | Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun |
|---|---|---|
| Type | MCP server | MCP server |
| GitHub stars | 54,572 | 0 |
| Stars, last 7 days | +171 | n/a |
| Forks | 6,228 | 0 |
| Upvotes | 0 | 0 |
| Language | Python | n/a |
| License | Apache-2.0 | n/a |
| Last commit | 1w ago | n/a |
| Created | Sep 2025 | n/a |
| Categories | Memory & knowledge, AI & LLM tooling, Productivity | Productivity |