Incorrect token being used for OAuth2

[Andrew-Staves-Activ]

We recently changed our Znuny install to use OAuth2 for fetching due to Microsoft disabling basic auth. for IMAP/POP. At the time we switched over to this, we also tried setting MultiSMTP's accounts to use OAuth2 Tokens. The problem was that MultiSMTP appeared to be trying to authenticate with the wrong token.

We were seeing the following for an auto-response:

As well as the following for a manually sent reply:

It appears that the token named on the NotificationSenderEmail's account was being used regardless of which SMTP mail account the email was being sent as. I'm not sure whether that token was being used because it was associated with the NotificationSenderEmail account or whether that was a coincidence.

Install details:

• Znuny 6.4.2
• MultiSMTP 6.3.1

Possibly relevant configuration

• Core::Email:
  • NotificationSenderEmail: otrs-notifications@example.com
  • SendmailModule: Kernel::System::Email::MultiSMTP
• MultiSMTP::Core
  • MultiSMTP::UseFallback: No
  • MultiSMTP::UseSenderFromMail: No

With SMTP accounts configured like this:

To be explicit, the email addresses and token names are examples and have been used in place of the real ones.

[joergflorian]

I‘d like to push this up a little as we see the exact same behavior in our system with latest Znuny 6.5.x and the latest add-on version.
If from both SMTP servers mails are sent around the same time, often the wrong OAuth token is taken.

Any fix or workaround for that?

Thanks for this great add-on Reneeb!