* Stefan Michael Guenther <s.guent...@in-put.de>: > Hello, > > one of our clients wants to offer mass mailing services for his clients. > > The problem is, that our client wants to send emails with the sender domains > of his clients from his own postfix server.
1. Make sure the sending server has matching forward/reverse DNS resolution for the hosts that send. 2. The client must list the sending servers IP in his DNS SPF record. 3. The client must publish a DKIM record in his DNS. The sending server must use the apropriate DKIM signing key. p@rick > As far as I know, some anti spam measure rely on the check, whether the > sending e-mailserver is the official MX for this domain. In this case the > check will of course fail, causing the emails to be blocked or at least > marked as spam. > > Is it possible to have 2 sending e-mailservers, one for the "normal" smtp > traffic and one for the "mass" smtp traffic? Is this just a question of two > MX entries in DNS configuration and is there any special to be considered > about the postfix configuration? > > Thanks for any hints & suggestions, > > Stefan > -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
