SOLVED Authenticated user cannot send mail as

[JOduMonT]

I'm able to send email from Rainloop but when I try to send email from KMail or Thunderbird I have this error on the server side: "message": "Authenticated user myemail@mydomain.tld cannot send mail as ",

• While I know my authentication is good because I'm able to receive.
• The error on the KMail side is: Failed to transport message. Connection refused

I thought it was related to this, even because my cloudron username have Capital Letter, but not my email address but even with the upgrade and a reboot I still have the same error.

Any idea where I could allow my user/email to send email from my client mail ?

PS: just to be sure, I'm talking about a mailbox, not an alias

[girish]

@JOduMonT Can you check the username of the Outgoing server? It needs to be the complete domain name and just the username. Like below:

In thunderbird, this is Account Settings -> Outgoing Server -> Select the server and Edit

[JOduMonT]

yes sadly my info is fine

NOTE: KMail is tricky for this you have to go to: Settings -> Configure KMail -> Accounts -> Sendings

PS: I'll try with Thunderbird

[girish]

@JOduMonT Oh, I just re-read your error message which is Authenticated user myemail@mydomain.tld cannot send mail as . This means that it did authenticate correctly but the email from address is empty. Maybe check in the identities tab (in the screenshot above). Does it have the correct From address?

[murgero]

@girish said in Authenticated user cannot send mail as:

This means that it did authenticate correctly but the email from address is empty. Maybe check in the identities tab (in the screenshot above). Does it have the correct From address?

There is actually 1 more possibilityt here: the user is attempting to send as an alias that does not exist for the account.

[JOduMonT]

it works with thunderbird, so I'll continue to investigate on the KMail side

@murgero potentially but this is why I mentioned

PS: just to be sure, I'm talking about a mailbox, not an alias

[JOduMonT]

Woah;

Now I understand why so much user end by not using KMail (if you are curious look at KDE forum and Reddit for KMail issue)

Basically @girish you were on the right track simply I had to go a little bit deeper
instead of looking under identities (because, of course, my Identity was well configured)
the issue is located under the sending configuration where you have to declare the mail email (not the alias even if my test is not with the alias.)

Anyway thanks for your help!