[exim] [OT] first mx has no A record

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Author: Heiko Schlittermann
Date:  
To: exim-users
Subject: [exim] [OT] first mx has no A record
Hello,

it's not really an exim issue, but I know we've some mail/RFC gurus here
:)


    === Trying mds-mp02.t-systems.com:25...
    === Connected to mds-mp02.t-systems.com.
    <-  220 mds-mp02.sczn.de ESMTP Mirapoint Messaging Server MOS 3.8.4-GA Queueing
     -> EHLO pu.schlittermann.de
    <-  250-mds-mp02.sczn.de Hello pu.schlittermann.de
    <-  250-8BITMIME
    <-  250-SIZE 52428800
    <-  250-ETRN
    <-  250-DSN
    <-  250-STARTTLS
    <-  250-AUTH LOGIN
    <-  250-AUTH=LOGIN
    <-  250 PIPELINING
     -> MAIL FROM:<info@???>
    <** 501 Sender domain must exist
     -> QUIT
    <-  221 mds-mp02.sczn.de Goodbye
    === Connection closed with remote host.



Indeed, the first MX of kugelbus.de (mail.kugelbus.de) doesn't exist (missing
A record).

Does exist some standard (RFC) saying that it's fatal mistake to have no
A record for the first MX? (But such mistake can happen anytime - if my
first MX is outside of my domain, and the MX-Admin decides to remove the
relevant A record. Than I'd rely on my second/third MX.)

(BTW: Exim seems to handle such situation the way *I* expect - the mail
is still routable.)


    Best regards from Dresden
    Viele Grüße aus Dresden
    Heiko Schlittermann
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