Sporadic TT512 errors

parkrun_Ian — Tue, 05 Dec 2023 12:40:26 GMT

I'm Tech Lead at parkrun and we're experiencing an issue that seems to be affecting an increasing number of our participants with @talktalk.net email addresses.

In each case, your servers are responding with:

smtp; 550 5.1.1 XXXXXXXXXXXXXX Recipient Undeliverable (TT512)

(where XXXXXXXXXXXXXX is a string of letters and numbers - seems to be unique each time)

Our outgoing mail service for these types of emails (AWS SES) regards this as a Permanent bounce so adds the address to a suppression list.

Can you please advice the best way to resolve?

Re: Sporadic TT512 errors

Divsec — Tue, 05 Dec 2023 14:10:52 GMT

Hi @parkrun_Ian your post has been escalated and you should hear soon.

topic Sporadic TT512 errors in Email

Sporadic TT512 errors

Re: Sporadic TT512 errors