spf.pobox.com.user.fm - URL scan, 23 Aug 2026

MalwareAnalyzer by Cyble scanned spf.pobox.com.user.fm and returned a unknown verdict (score 6). The page resolved to 103.168.172.37 on Fastmail Pty Ltd t/a Fastmail in US. 3 domains and 1 IP were contacted. The request followed 1 redirect before landing. This is a point-in-time observation from 23 Aug 2026; the page may have changed since.

Scan result

• Verdict: unknown (score 6) · Confidence 9%
• Scanned URL: http://spf.pobox.com
• Domain: spf.pobox.com.user.fm · IP: 103.168.172.37 · AS151847 · US
• Server: nginx
• Page title: Not Found
• HTTP status: 404 · text/html; charset=utf-8
• Scan tier: standard · observed 2026-08-23 17:50:05 UTC

Redirect chain

1. http://spf.pobox.com/
2. http://spf.pobox.com.user.fm/

Antivirus & YARA (0 of 48 engines)

No engine flagged this page's content.

Why this verdict

• Served over plaintext HTTP

Detected technologies

• Nginx

Contacted infrastructure

• 103.168.172.37 - AS151847 Fastmail Pty Ltd t/a Fastmail (United States)

Observed indicators

• spf.pobox.com.user.fm
• www.fastmailusercontent.com
• www.fastmail.help
• 103.168.172.37
• http://spf.pobox.com.user.fm/
• https://www.fastmailusercontent.com/filestorage/css/main.css
• https://www.fastmail.help/hc/en-us/articles/1500000280141

Questions about spf.pobox.com.user.fm

Is spf.pobox.com.user.fm safe?

The scan of spf.pobox.com.user.fm on 23 Aug 2026 reached no verdict either way (score 6). Too little was captured to judge it, which is an unknown rather than a pass.

How was spf.pobox.com.user.fm checked?

A static pass resolved DNS, captured TLS and headers and followed the redirect chain, and where the standard tier allows, a headless browser rendered the page and recorded every request. Egress is SSRF-locked. Signatures that matched only page text are weighted far below one that matched a served file, because a page documenting malware matches the same rules.

Scanned at the standard tier - see how URL scanning works.

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