On Thu, Mar 10, 2016 at 01:54:12PM +0000, Pascal Maes wrote: > From time to time, one of our users is caught by a phishing > attempt. His account is then used to send spam and generally > the MAIL FROM does not match one of our addresses. snip > Would it be possible to test only the existence of the MAIL > FROM ?
postconf.5.html#reject_unlisted_sender reject_unlisted_sender Reject the request when the MAIL FROM address is not listed in the list of valid recipients for its domain class. See the smtpd_reject_unlisted_sender parameter description for details. postconf.5.html#smtpd_reject_unlisted_sender smtpd_reject_unlisted_sender (default: no) Request that the Postfix SMTP server rejects mail from unknown sender addresses, even when no explicit reject_unlisted_sender access restriction is specified. This can slow down an explosion of forged mail from worms or viruses. (Especially read the rest of that, the "details" referred to from reject_unlisted_sender.) -- http://rob0.nodns4.us/ Offlist GMX mail is seen only if "/dev/rob0" is in the Subject: