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form mails and sender verification

From: Zbigniew Szalbot (z.szalbotlc-words.com)
Date: Fri Jun 20 2008 - 01:06:30 CDT


I am looking for an advice how to configure form mails on web pages so
that I avoid something like this:

Jun 20 07:31:28 relay postfix/smtp[12391]: E982BB8026:
to=<someonehotmail.fr>, relay=mx1.hotmail.com[]:25,
delay=1.6, delays=0.11/0/0.78/0.69, dsn=2.0.0, status=sent (250 mail
from IP soft failed sender ID check. Please ensure this
IP is authorized to send mail on behalf of [hotmail.fr])
Jun 20 07:31:28 relay postfix/qmgr[34924]: E982BB8026: removed

There's a form which people can use to send an e-card to someone else.
So our relay server may be used to relay an email from any domain to any
domain. However, we have configured SPF records and are using DKIMs.

Do I understand correctly that for such setup to work, the envelope-from
field should have a valid email at our domain?

Many thanks in advance! And last but not least - many thanks for postfix!

Zbigniew Szalbot