Outgoing email relay through Spectrum servers seems to have stopped working in May 2023

jrmayfield Posts: 12 Participant
edited September 2023 in Internet 2023 Archive

Hi. I have several services on my home network that send alerts to my Gmail address so that I can see them immediately wherever I may be at the time. Things like hard drive failures, over-temperature alerts, etc.

Since Spectrum doesn't allow simple outgoing SMTP connections, I've configured Postfix on my Linux server to relay outgoing mail through Spectrum using my @twc.com credentials. This has worked since early 2015 but appears to have stopped working on 2 May 2023. All attempts to relay mail through Spectrum now fail with an SASL authentication failure:

023-05-02T23:16:10.794099-04:00 MYMACHINE postfix/smtp[28530]: D32D04B04D0: to=<[MYGMAILADDR@gmail.com>, relay=mail.twc.com[]:587, delay=0.93, delays=0.01/0/0.92/0, dsn=4.7.0, status=deferred (SASL authentication failed; server mail.twc.com[] said: 535 5.7.0 ...authentication rejected)

I can verify that my webmail.twc.com credentials haven't changed and the password still works. So I'm not sure why SASL authentication is now failing. Did Spectrum make a change earlier this month?


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