SMTP Error: 503 Command sequence error

[athurdent]

I have migrated my 2.1 setup to a 2.2 test machine and put it in "home production" ;)
Found another problem. The settings below used to work but in 2.2 they don't, no mails are sent out.

Error:

Nov  1 08:07:00 beta php: sendmail: Could not send the message to xxx@xxx.de -- Error: 503 Command sequence error

I also tried almost every possible combination but cannot seem to get any mail out with 2.2.

Maybe this helps fixing it, someone seems to have had the same problem with my provider and resolved it like this:
https://github.com/andris9/Nodemailer/issues/26