Hai, ... its all about correct DNS settings, so dont say that does not matter..
Best is you read : rfc2821 section-3.6 and 4.1.1.1 ( and 10.3 thank you Michael good read, i forgot that one.. ) rfc5321 section 2.3.5 in short.. make sure your hostname has an A or AAAA record and PTR record. make sure your MX point to a correct hostname. make sure your mail server ehlo : (smtpd_banner) is set to a resolvable hostname, requerements for ehlo: DNS RR of type A is required, and there is no requirement for the A record to match the client connecting IP address (As per RFC 1123 Section 5.2.5). when a connecting host uses the EHLO command to identify itself and where the hostname contains characters that are not one of the following: "a-z", "A-Z", "0-9", "." and "-" Further the hostname should start with a letter of the alphabet. Greetz, Louis >-----Oorspronkelijk bericht----- >Van: rwhee...@artifact-software.com >[mailto:owner-postfix-us...@postfix.org] Namens Ron Wheeler >Verzonden: dinsdag 18 augustus 2015 16:14 >Aan: postfix-users@postfix.org >Onderwerp: Re: Postfix and Mailman 2 virtual alias domain integration > >This is pretty common. >The DNS does not matter all that much as long as people can >find the MX >server for each domain. >The MX record has to point to an A or CNAME that maps to the actual >machine where your main service (Postfix) runs. >The A or CNAME can be in a different domain as long as that is >resolvable to an IP somehow. >Every Domain can have its MX point to smtp.B.tld as long as smtp.B.tld >resolves to something in the B domain's DNS. >This is probably easiest since you can move all SMTP traffic with a >single change in the DNS for B.tld. > >In the end the foreign SMTP server has to be able to reach someone who >will take the mail off its hands and the DNS serves that purpose. >Once the mail is transferred to the "right" IP address, the sender >doesn't care how you organize your domains internally. > >Ron > >On 18/08/2015 8:55 AM, Tom Browder wrote: >> On Sun, Aug 16, 2015 at 3:36 PM, @lbutlr <krem...@kreme.com> wrote: >>> On 16 Aug 2015, at 10:44 , Tom Browder ><tom.brow...@gmail.com> wrote: >>>> Okay, then I guess I should pick one of the virtual hosts >as the domain name and add some arbitrary host then. Does >that mean it is then a "real" server and should not be treated >as a virtual domain? >>> You need a reasonable helo name and you need an rDNS that matches. >> Okay, let me be more specific: >> >> On a single Apache/Postfix/MM2 server I have domains A.tld ... Z.tld, >> each of which I want to have mail delivered to/from. I will choose >> B.tld as the non-virtual server (with FQHN mail.B.tld). I have a >> single IP address, say, 9.9.9.9, to which all domains are mapped. >> >> So how should the DNS records look? Can anyone give me the exact >> settings for the A, CNAME, MX, and PTR records for A.tld and B.tld >> (and any other suggested records)? >> >> Many thanks. >> >> Best, >> >> -Tom >> > > >-- >Ron Wheeler >President >Artifact Software Inc >email: rwhee...@artifact-software.com >skype: ronaldmwheeler >phone: 866-970-2435, ext 102 > >
