postfix-users April 2011 archive
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postfix-users: Re: Rev DNS not match SMTP Banner, will it bite

Re: Rev DNS not match SMTP Banner, will it bite me ?

From: mouss <mouss_at_nospam>
Date: Sat Apr 16 2011 - 22:13:05 GMT
To: postfix-users@postfix.org

Le 09/04/2011 08:44, Voytek Eymont a écrit :
>
> I'm setting up a mail server on a virtual server
>
> smtp banner is set to myhost.mydomain
>
> reverse dns resolves to the data centre IP address
>

- smtpd banner matters for inbound mail (i.e. for receiving)
- reverse dns matters for outbound mail (i.e. for sending)

many sites use different servers for these different roles (MX versus MSA).

> is that going to cause me problems in the future ?
>

no.

that said, if the reverse dns "looks dynamic" or "generic", then some
sites may block mail from your server.

> -------------
> mxtoolbox:
> OK - 111.111.222.333 resolves to server.domain.tld
> Warning - Reverse DNS does not match SMTP Banner
>
>