FastmailUA

What is FastmailUA?

About

FastmailUA is Fastmail's content fetcher and image proxy service that retrieves external images and content for email security. It protects users from tracking pixels and malicious content by proxying external resources through Fastmail's secure servers. You can see how often FastmailUA visits your website by setting up Dark Visitors agent analytics.

Expected Behavior

Fetchers visit websites on-demand. They're normally dispatched by apps to present metadata about a link (e.g. the title and thumbnail image) to a user.

Type

Fetcher
Fetches web content on behalf of an app

Detail

Operated By Fastmail
Last Updated 18 hours ago

Insights

Top Website Robots.txts

0%
0% of top websites are blocking FastmailUA
Learn How →

Country of Origin

Australia
FastmailUA normally visits from Australia

Global Traffic

See All Global Bot & LLM Insights →

The percentage of all internet traffic coming from Fetchers

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Robots.txt

Should I Block FastmailUA?

Probably not. If you block a fetcher, it won't be able to fetch the metadata it needs to display a link preview. Fewer people will click on the link to your website without this.

How Do I Block FastmailUA?

⚠️ Manual Robots.txt Edits Are Not Scalable
New agents are created every day. Instead, serve a continuously updating robots.txt that blocks new agents automatically.
Set Up Automatic Robots.txt

You can block FastmailUA or limit its access by setting user agent token rules in your website's robots.txt. Set up Dark Visitors agent analytics to check whether it's actually following them.

User Agent String Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.5993.117 Safari/537.36 FastmailUA/1.0 
# robots.txt
# This should block FastmailUA

User-agent: FastmailUA
Disallow: /

References