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Fastmail Bot

GoodBotVerifiedBOT

Fastmail fetch and image proxy bot Operated by Fastmail.

GoodBot
Assessment
Page Preview
Category
BOT
Kind
1
Data sources
AI-generated summary, drawn from Cloudflare, operator docs, and community data

What is Fastmail Bot?

Fastmail Bot is a web crawler operated by Fastmail. Fastmail fetch and image proxy bot

Helpful — Verified, safe crawler. Respects robots.txt and provides operator documentation.

Identification

Bot name
Fastmail Bot
Operator
Fastmail
Category
Page Preview
Kind
BOT
Verification
Verified bot
Cloudflare slug
fastmail-bot
User-agent patterns
FastmailUA
User-agent strings
FastmailUA/1.0
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.5993.117 Safari/537.36 FastmailUA/1.0
Main use cases
Link preview generationThumbnail creationSocial media cards

Why it crawls your site

Fastmail Bot crawls websites to generate link previews and thumbnails for shared URLs. It is operated by Fastmail as part of their link preview infrastructure. If you see this bot in your server logs, it is a verified crawler and generally safe.

Block or allow Fastmail Bot

Block it

Add a Disallow rule for FastmailUA in your robots.txt file. You can also block at the server level using your web server configuration or CDN firewall rules to filter requests matching the user-agent string.

# Block Fastmail Bot from crawling your entire site
User-agent: FastmailUA
Disallow: /

# Allow Fastmail Bot full access
User-agent: FastmailUA
Allow: /
Allow & verify

Ensure your robots.txt allows FastmailUA. Verify requests are genuine by checking the user-agent string and referring to Fastmail's documentation.

Traffic & trends

Cloudflare Radar traffic

No Cloudflare traffic data available.

Google Trends interest

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Data sources

This profile is compiled from the following sources.

CloudflareRadar
Last updated July 26, 2026