After some experimentation I think I can compress this problem down to one question:
Is it possible for an OpenSMTPD host to process email addressed to two different host names, both of which resolve to the same address? When I set "mailname," any mail sent to that name works fine. Mail addressed to the alternate host name loops. I thought the "virtual" keyword would be for this purpose, but I've had no luck with it. Thanks, On Tue, Feb 9, 2016 at 10:44 AM, Michael Burk <mich...@burkzoo.net> wrote: > Thanks Craig for the reply. > > I changed the CNAME to an A record as you suggested. Sadly, it still loops > when I send the email to the "alternate" name. It seems that OpenSMTPD > doesn't realize that the two names are the same server. > > I should mention that the whole reason we have an alias is that I have two > servers setup as mail servers, and the alias gives us an easy way to switch > hosts if one goes down (all mail is addressed to the alias). Also, I have > no MX records. I don't know if I should, but Sendmail has always worked > without it. > > On Tue, Feb 9, 2016 at 4:42 AM, Craig Skinner <skin...@britvault.co.uk> > wrote: > >> Hi Michael, >> >> On 2016-02-08 Mon 16:49 PM |, Michael Burk wrote: >> > >> > If I send a message to the server's CNAME, it goes into a loop which is >> > eventually detected and shut down: >> > >> >> Try switching from DNS CNAMES to DNS A records: >> >> RFC2181 has: >> >> "10.3. MX and NS records >> >> The domain name used as the value of a NS resource record, or part of >> the value of a MX resource record must not be an alias. Not only is the >> specification clear on this point, but using an alias in either of these >> positions neither works as well as might be hoped, nor well fulfills the >> ambition that may have led to this approach. This domain name must have >> as its value one or more address records. Currently those will be A >> records, however in the future other record types giving addressing >> information may be acceptable. It can also have other RRs, >> but never a CNAME RR. ...." >> >> http://tools.ietf.org/html/rfc2181#section-10.3 >> >> -- >> You received this mail because you are subscribed to misc@opensmtpd.org >> To unsubscribe, send a mail to: misc+unsubscr...@opensmtpd.org >> >> >
