SMTP connection failure: SMTP failed to connect: received corrupt message of type InvalidContentType.
Delta Chat version
2.34.0 Android and 2.35.0 Windows 10
Expected behavior
Messages should be sent as before
Actual behavior
Outgoing messages stopped sending for one user for no apparent reason (showing only spinning circle animation) and the “Connectivity” settings say under “Outgoing Messages”: “Error: SMTP connection failure: SMTP failed to connect: received corrupt message of type InvalidContentType.”
The last message sent successfully was December 7, 9:24pm. Was that before a recent app update? Or did this user receive something that corrupted everything? Or did they send something that corrupted everything?
Restoring the account to a second DeltaChat device shows the same problem. Adding the account into a different SMTP email program shows no problem: normal emails can be sent and received without error on other email programs. No other users on the same server seem to have this problem. This is a Dovecot/Postfix server I set up before Chatmail existed.
The server’s TLS certificate was updated Dec 11 and is valid:
| Issued On | Thursday, December 11, 2025 at 6:57:58 PM |
|---|---|
| Expires On | Wednesday, March 11, 2026 at 7:57:57 PM |
| a |
Should I make a totally new profile with the same account to see if that works? All of the previous encrypted messages will be unreadable in that case though, correct?
deltachatlog.txt (32.3 KB)