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

jrmayfield

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=<[[email protected]>, relay=mail.twc.com[47.43.26.4]:587, delay=0.93, delays=0.01/0/0.92/0, dsn=4.7.0, status=deferred (SASL authentication failed; server mail.twc.com[47.43.26.4] 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?

Randy_S

Good evening @jrmayfield !

As far as I know the authentication protocol is SSL. Not sure how Linux/Postfix works but you can check out our email server support page for all the current mail server settings.

Randy