svdr: > What can I do to find the reason for the timeouts? You need to find out where in the SMTP protocol the timeout happens.
- TCP connection setup.
- SMTP Server '220' initial response.
- EHLO, MAIL FROM, RCPT TO, DATA, end-of-data.
Ideally, the PHP client would provide that information.
Postfix logging will show 'lost connection after XXX', but that
happens only for a completed TCP connection.
Wietse
