I posted the following on the sendmail (comp.mail.sendmail) newsgroup, but I don't get any reaction. I realise this is not a mimedefang problem, but I'm sure some of you have also run into this issue.
RFC 821 section 3.7 states "Whenever domain names are used in SMTP only the official names are used, the use of nicknames or aliases is not allowed.". This however changed in RFC 2821 section 3.6 where is states that CNAME RRs may be used. Currently Sendmail still rewrites the sender domain. Does this mean that the default behaviour of Sendmail is not RFC compliant or are there other RFCs that still limits the use of CNAMEs with MX records (maybe RFC 1034 section 3.6.2)? Thanks P.S. I know the setting confDONT_EXPAND_CNAMES will disable this behaviour, but I would prefer not to implement this. Also I cannot modify the DNS records since it is an external DNS server. They insist their DNS settings are RFC compliant. Their DNS records looks like this: c.domain.com IN A 1.1.1.1 a.b.domain.com. IN CNAME c.domain.com. c.domain.com. IN MX 10 mail.domain2.com c.domain.com. IN MX 20 mail2.domain2.com [email protected] will be rewitten to [email protected] _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
