On Fri, Feb 21, 2020 at 08:47:36AM -0600, Tom Browder wrote: > On Fri, Feb 21, 2020 at 08:37 Henning Follmann <hfollm...@itcfollmann.com> > wrote: > > > On Fri, Feb 21, 2020 at 12:38:45PM +0100, john doe wrote: > > ... > > > Don't do THAT! > > > > RFC2181 section 10.3 says you can't point your MX record to a CNAME > > > > Maybe that's why Namecheap has the MXE record that points to an IP. > > Besides the relevant RFCs, can anyone recommend a good book that covers all > this. I have a couple of the O'Reilly books on "Postfix" and "DNS and Bind" > and I am going back to refresh myself, but any other recs? >
For years I operated a couple of sendmail installations. That and the O'Reilly Sendmail book tought me a lot. Today I prefer postfix. There is a german book from Peer Heinlein. This is an excellent source if you want to set up a multidomain mailserver completely driven by a LDAP directory. -H -- Henning Follmann | hfollm...@itcfollmann.com