Issue plesk-sendmail: Unable to prepare arguments for mail handlers.

[tanjix_]

Hi Guys, on my Plesk Obsidian (18.0.40) instance on Debian 9 I am unable to send mail through a web-application.

The log reports this for every outgoing mail:

plesk-sendmail[57114]: S57114: Unable to prepare arguments for mail handlers.
plesk-sendmail[57115]: S57115: get_message_headers: Can't parse the header line 'This is a multi-part message in MIME format.#012' (name of the header can't be extracted from the line)

Any advise about what can be done would be absolutely helpful!

Thanks a lot!

 

[Monty]

To me this looks like a problem of your web application. It appears to not create a valid mail with valid headers.
Check your web application and make sure it generates proper headers. Each header must be on a separate line with proper line breaks.

 

[dundee]

Same here. Looks like plesk-sendmail is now not able to parse multi-part message correctly. It was working fine few days ago.

 

[dundee]

Just verified, that the message can be send through other smtp mailer (python smtplib) but fails with plesk-sendmail.

 

[dundee]

My bad, the problem was with passing additional headers as headers to mail PHP function.
It should be passed to body.

See Error with PHP mail(): Multiple or malformed newlines found in additional_header