mail forwarding to 1and1

Have a site on ISPConfig using dns and mail servers from 1and1

The site is and e-commerce (oscommerce) website and needs to have email requests for info forwarded from the site to a 1and1 mailbox (pop3), which has been set up and works.

I can send a manual email from the site to anywhere and get it delivered INCLUDING the 1and1 address.

I can generate and email request via a form and php script from the site to any address I specify and get it delivered EXCEPT to the address at 1and1.

I can deliver from the site to my gmail address and have it forwarded by filter to 1and1 and get it delivered.

If I use the 1and1 address as a forwarding target from an email address at another (unrelated) site on the same ISPConfig server, call it address A, then send an email it DOES NOT arrive at the 1and 1 address call it account B.

If I send the same email from this address (A) to my gmail account with an automatic forwarding (filter) to B at 1and1 it arrives.

Why can I not forward direct from account A in IspConfig to account B at 1and1?

 

mail log

Thanks Till, here's the last part of the log. Not black listed.

 

Doh!

Now here's the last part of the log

Sep 19 01:26:12 cl-t023-040cl dovecot: POP3(web13_roomings): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0
Sep 19 01:26:14 cl-t023-040cl dovecot: pop3-login: Login: user=<web13_roomings>, method=PLAIN, rip=::ffff:81.136.250.113, lip=::ffff:72.55.150.165
Sep 19 01:26:14 cl-t023-040cl dovecot: POP3(web13_roomings): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0
Sep 19 01:26:32 cl-t023-040cl sendmail[17013]: l8J5QWkS017013: from=apache, size=402, class=0, nrcpts=1, msgid=<[email protected]>, relay=apache@localhost
Sep 19 01:26:32 cl-t023-040cl postfix/smtpd[17014]: connect from localhost.localdomain[127.0.0.1]
Sep 19 01:26:32 cl-t023-040cl postfix/smtpd[17014]: setting up TLS connection from localhost.localdomain[127.0.0.1]
Sep 19 01:26:32 cl-t023-040cl postfix/smtpd[17014]: TLS connection established from localhost.localdomain[127.0.0.1]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Sep 19 01:26:32 cl-t023-040cl sendmail[17013]: STARTTLS=client, relay=[127.0.0.1], version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-SHA, bits=256/256
Sep 19 01:26:32 cl-t023-040cl postfix/smtpd[17014]: E4DBB25981D3: client=localhost.localdomain[127.0.0.1], [email protected]

Could this be because localhost in postfix?

 

Solved. grrrr!

Till, sorry mate!

Idiots who set up database in oscommerce hid email options. Had 'em set to sendmail lf, and all, with dns checking on. Done. Sorry to vex you with it.