Rainer Dorsch wrote: > Am Montag, 18. Mai 2020, 19:58:06 CEST schrieb Dan Ritter: > > Rainer Dorsch wrote: > > I think you're overcomplicating it. > > > > Your domain can and should have two or more MX records, with > > different priority levels. The MX records don't even have to > > point to names in your domain. > > > > Since you're using Let's Encrypt, certificates are free. So, > > for each mail server, set up an A and/or AAAA record. Add those > > to the MX records for your domain. Have LE produce certificates > > for the mail servers under the names they have assigned. > > > > Any mail sender will try each of your MX records, stopping when > > it gets to a working entry. Some spammers will try in reverse > > order, hoping that you don't have anti-spam measures on your > > secondary mail server. > > > > Just curious, if I have multiple MX records, how would you sync the incoming > emails (*) ? I can see with an NFS mounted home directory with Maildir > mailboxes that could work and dovecot could probably run on multiple hosts > (or > at least it would be possible to switch the imap DNS entry if needed). But > then the NFS server is the single point of failure. Are there better ways to > sync the mail servers behind the MX records than NFS?
Yes. dovecot-sync is quite fast relative to most mailservers. -dsr-
