[ On 2014-05-28 at 20:07:22, Markus Reschke wrote to Michiel van der Vlist ]
MR> my email address could have failed. My guess is that the forward and MR> reverse mapping differ. But it would be nonsense to check that, MR> because that's a typical setup for small businesses running their MR> services on a few servers instead of a dedicated server for each MR> service.
My mail server will reject RDNS mismatches too - it stops a TONNE of spam. The solution is simply to not try and be cute with "mail.domain.com" if your server isn't actually called "mail". www/ftp/mail can still be CNAMEs as long as the MTA knows what its real name is.
--- Captain! Someone's snorted all the dilithium!!!! * Origin: sysgod@sysgod.org (3:712/848)
