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:<[EMAIL PROTECTED]>
<** 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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