[bug]: `OAUTHBEARER` SASL mechanism does not work in SMTP

[mdecimus]

What happened?

This happened:

smtp::inbound::session: event="write" data="535 5.7.8 Authentication credentials invalid.\r\n" size=47
smtp::inbound::auth: context="auth" event="authenticate" result="failed"
smtp::inbound::session: event="read" data="AUTH OAUTHBEARER bixhPWluZm9AMC0wLmh1LAFhdXRoPUJlYXJlciAzaGdEYkVZcjZIQ2hXK2pYUTdlU2l3akplSk1IeUE0c2duVElnVHMreGQzcnZSeStxMGJnL24vSS8yWXVzaFZsU3N5dGx2RUNjbTkxYm1SamRXSmwBAQ==\r\n" size=175

imap::core::session: event="write" data="A0001 OK [CAPABILITY IMAP4rev2 IMAP4rev1 ENABLE SASL-IR LITERAL+ ID UTF8=ACCEPT IDLE NAMESPACE CHILDREN MULTIAPPEND BINARY UNSELECT ACL UIDPLUS ESEARCH WITHIN SEARCHRES SORT THREAD=REFERENCES LIST-EXTENDED ESORT SORT=DISPLAY SPECIAL-USE CREATE-SPECIAL-USE MOVE CONDSTORE QRESYNC UNAUTHENTICATE STATUS=SIZE OBJECTID PREVIEW] Authentication successful\r\n" size=351
imap::core::client: event="read" data="A0001 AUTHENTICATE OAUTHBEARER bixhPWluZm9AMC0wLmh1LAFhdXRoPUJlYXJlciAzaGdEYkVZcjZIQ2hXK2pYUTdlU2l3akplSk1IeUE0c2duVElnVHMreGQzcnZSeStxMGJnL24vSS8yWXVzaFZsU3N5dGx2RUNjbTkxYm1SamRXSmwBAQ==\r\n" size=189

How can we reproduce the problem?

I can reproduce the problem by doing the following steps:

Version

v0.8.x

What database are you using?

None

What blob storage are you using?

None

Where is your directory located?

None

What operating system are you using?

None

Relevant log output

No response

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