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Appreciate if someone could let me know what is happening here please.

Sent an email to a contact of mine and received back the following error (I've ***'ed the email address for privacy reasons).

Quote:

<c***@s****.com>: host mx1.spamwall.co.uk[82.221.110.2] said: 550 A URL in this email (fastmailusercontent . com) is listed on https://spamrl.com/. Please resolve and retry (in reply to end of DATA command)

The MX record for s****.com is mx1.spamwall.co.uk. It looks like fastmailusercontent.com is being blacklisted. Am I correct?

How can I resolve this? Or is it down to Fastmail?

cheers
E

The message should mean that fastmailusercontent.com is on the Spamhaus DBL (domain blocklist). However, I just did a check at https://www.spamhaus.org/lookup/ and that domain is not on the DBL. I suggest retrying the sending of your message. I suspect it was a short term issue (possibly even an error by Spamhaus). If the message is still failing, open a support ticket.

Quote:

Originally Posted by BritTim (Post 606627)

Cheers

I subsequently sent the email and redacted all references to fastmailusercontent.com (arose due to an attachment from a previous email in the same thread) and message went through just fine.

I assume Fastmail have a process of catching when their domains and/or IP address ranges get on spamlists and take appropriate actions. So I won't bother annoying them with a ticket.

Luckily the MX server sent me a fail message so I could take action. One has to wonder how many MX servers don't bother and simply discard messages based on blacklists.