Fastmail Bot

Review

Fastmail Bot is a web scraper from Fastmail used for public web data collection, page extraction, content monitoring.

User-Agent

FastmailUA

User-agent strings are identity signals, not proof of identity. Confirm the source and behavior before trusting a request.

Verification and Detection

Verification method: Verify Fastmail Bot by matching `FastmailUA` to Fastmail evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.

Fastmail Bot traffic is primarily detected by the `FastmailUA` user-agent pattern; a representative HTTP user-agent is `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`. Compare source IPs, reverse DNS, request paths, and crawl cadence with Fastmail infrastructure before trusting the traffic.

Handling Guidance

Use this record as identity context. Verify the request source, behavior, and relevance to your site before allowing or restricting traffic.

Fastmail Bot is used for public web data collection, page extraction, content monitoring, and third-party crawler activity.

Record Details

Aliases: FastmailUA
Type: scraper
Operator: Fastmail
Family: Fastmail
Kind: Preview
Purpose: Scraping
Identity: Verified Bot
Detection confidence: Medium
Spoofing risk: Fastmail Bot Has Medium Spoofing Risk Because User Agent Strings Can Be Copied; Pair The Match With DNS, IP, Behavior, Or Operator Evidence.
Status: Active
Respects robots.txt: Unknown
Last verified: 2026 04 01

Robots.txt Snippet

User-agent: FastmailUA
Disallow: /