Am Donnerstag, den 13.10.2011, 10:57 +0200 schrieb Ernst du Plooy: > 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]
Old thread, but I ran into the same problem on Ubuntu 14.04 LTS (sendmail 8.14.4) today. Setting confDONT_EXPAND_CNAMES to True fixed it. Shouldn't that be put to default sendmail.mc? Took me three beer to figure out the problem, because I never looked into that dark corner. Ciao! Marcus _______________________________________________ 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
