[SMTP] AUTH LOGIN

[w4tzmann]

Hi :)
I'm not sure if this is a bug, a feature request, or i'm just making a mistake in the setup.
I am trying to send the email notification for watchtower via a microsoft exchange 2019 server, via starttls and user auth.
Exchange offers with AUTH GSSAPI NTLM LOGIN.
Unfortunately, according to the documentation, shoutrr cannot do any of these.

Currently the "WATCHTOWER_NOTIFICATION_URL" looks like this: "smtp://%upn%:%password%@%fqdn-ex%:587/?from=%fromaddress%&to=%toadress%&ClientHost=watchtower.local"

The watchtower log shows the following:

level=error msg="Failed to send shoutrrr notification" error="failed to snd using smtp: timed out".

The Exchange transport log has the following relevant entries:

504 5.7.4 Unrecognized authentication type
500 5.3.3 Unrecognized command '*'.
QUIT
221 2.0.0 Service closing transmission channel

Has anyone successfully used this constellation?
Is there an easy way to teach shoutrrr "AUTH Login"?

I would be happy to help with testing and provide more information.

Thanks and greetings

[piksel]

It could be possible to implement LOGIN authentication for the go email client. I think I managed to get it working in a PoC at some point, but it never went further than that.

[w4tzmann]

Right now I have "solved" the problem by using a Docker postfix container as a relay.
I did a little research on this topic. I really don't understand why the GO net/smpt library doesn't include AUTH LOGIN method. I found some workarounds to implement the function, but my first attempts didn't work unfortunately. Since I'm not really a programmer (much less a golang), I decided to take the easy way out and spin up a mail relay. The effort to create a custom Docker image (for each Go application) incl. customization of the Go files seems too big for just a simple notification, which I can ignore 99% of the time anyway :D

If someone has a working solution ready, I'll be happy to test it.