I can’t add an email channel for the group, even though I have unsecured access turned on, when I add a new email, the message end of file reached ,
smtp part is faulty, although I use outlock using normal smtp
Your mail server prematurely closes the connection or sends a malformed response.
This is nothing you can solve on Zammad end. This happens sometimes in hosted setups and self heals within 10-15 minutes. That is for existing accounts.