Matthias-Christian Ott <[email protected]> (So 10 Okt 2010 23:05:40 CEST): > example.com. IN CNAME b.example.com. > example.com. IN MX 10 mx.example.com. > b.example.com. IN A 198.51.100.2 > mx.example.com. IN A 198.51.100.3 > > According to RFC 1912 there can't be other RRs if there's already a > CNAME. It seems some SMTP servers followed the DNS RFC very closely and
… That's what some of the RFCs are for, I'd say. > didn't send E-Mails at all. But this doesn't explain why that particular > SMTP server rewrote the recipient (after I added a transitional MX > record for b.example.com ebay.com did the same). Yes, this behaviour is expected - I think, some SENDMAILs rewrite the envelope if they're faced with CNAMES in domain names or mx records. You can't do anything against this, other than not using CNAMEs at all. -- Heiko
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