Problem with my PostFix configuration

deb20125 · 11-15-2011, 09:58 AM

Hello,

Like the title says, i have a problem with my PostFix configuration using Ubuntu.

I have a server that hosts multiple websites / domains / email. Some of these websites use a PHP contact form that sends email using the PHP mail function.

Everything seemed to work perfect, untill someone tries to use a contact form attached to an e-mail adress that issn't hosted at my server. The e-mail gets bounced (see error log)...

Sending an e-mail to Hotmail or Gmail works like a charm though

Code:

Nov 15 16:09:39 dedi563 postfix/smtp[27021]: 0F24CCF2257: to=<email[at]example.com>, relay=mail.daltecnet.nl[193.36.186.22]:25, delay=0.5, delays=0.09/0/0.4/0.01, dsn=5.1.8, status=bounced (host mail.daltecnet.nl[193.36.186.22] said: 553 5.1.8 Sender address <www-data@dedi563.pcextreme.nl> domain does not exist (in reply to MAIL FROM command))

catkin · 11-15-2011, 11:10 AM

It's normal. mail.daltecnet.nl checks to see if dedi563.pcextreme.nl is publicly DNS resolvable and, when it is not, refuses to accept the mail.

deb20125 · 11-15-2011, 11:31 AM

So, how can i make sure that dedi563.pcextreme.nl is "publicly DNS resolvable" ?

catkin · 11-16-2011, 12:48 AM

You could set up a public MX record for it -- if you have the authority to administer pcextreme.nl DNS records.

deb20125 · 11-16-2011, 02:14 AM

I do have the authority. Can/will you tell me where and how to do this?

catkin · 11-16-2011, 02:24 AM

Sorry -- I have done little DNS administration and have no idea how your DNS server is accessed so cannot help.