I tag it OT, as the comment is on the policy itself. On Sun 15/Jun/2014 22:11:29 +0200 li...@rhsoft.net wrote: > Am 15.06.2014 22:01, schrieb Eliezer Croitoru: >> I Have been reading: >> http://www.postfix.org/ADDRESS_VERIFICATION_README.html >> http://www.postfix.org/SMTPD_ACCESS_README.html >> http://www.postfix.org/RESTRICTION_CLASS_README.html >> >> And I am still unsure on how to go one step forward.. >> I want to allow my local SMTP authenticated users to be able to send only >> with a From of the local domains of the >> local service. >> For example I have about 10-20 domains that the server is serving and I want >> to allow to send from domains: >> example.com OK >> hotmail.com REJECT >> example2.com OK >> etc... > > what you describe is *the minimum* requirement of a sane MTA > you must not allow senders you would not accept incoming messages > and no - there are no exceptions for whatever user > > http://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_sender
An exception to this rule is the ability to use mail services provided by external domains, for example Trashmail.net. I tried to persuade Stephan to turn his service into a distributed method for using disposable addresses, but he declined: https://ssl.trashmail.net/forum/viewtopic.php?f=2&t=5421&start=24 Some sites allow using foreign addresses, for example Gmail. They verify the address, and then provide for using a foreign domain's key for DKIM signing, or relaying via the foreign domain's MSA service. Ale
