FastmailUA

Listed only

Fastmail's server-side fetcher, used on behalf of its mail users. It proxies images embedded in messages so that no browser cookies, browser user agent or user IP address reach the remote server, and it fetches subscribed ICS and remote CalDAV calendars. Fastmail documents that every user agent it sends contains the string FastmailUA.

Operated by Fastmail · Official documentation

User agents

Patterns this directory matches, with real observed strings.

regexFastmailUA/\d
observedMozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.5993.117 Safari/537.36 FastmailUA/1.0
observedFastmailUA/1.0

How to verify

No verification recipe published by the operator.

Good Bot Practices scorecard

Identifies honestly
Stable UA token documented (1 pattern)
Verifiable
Operator publishes no verification path
Respects robots.txt
Does not honor robots.txt
Behaves
Crawl-rate behavior is operator-declared; not machine-verifiable from this dataset
Reachable operator
Operator and documentation published

Measured against the Good Bot Practices.