Am 05.07.2017 um 19:15 schrieb Viktor Dukhovni: > On Wed, Jul 05, 2017 at 06:57:17PM +0200, Stefan Sticht wrote: > >> Is there a RFC or similar which suggests/requires that the helo name should >> be DNS resolvable? > > SMTP is defined in RFC 5321 (which obsoletes 2821 and 821). >
I think the question might be : is reject_unknown_helo_hostname rfc alike today, it wasnt in the past postfix faqs are only pointing on reject_non_fqdn_helo_hostname for rfc additional reject_invalid_helo_hostname is acceptable in real world setups Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
