Greetings, On Thu, Feb 11, 2010 at 10:11 AM, <te...@cnysupport.com> wrote: > Quoting Jonathan Tripathy <jon...@abpni.co.uk>: > >> Hi Folks, >> >> Does anyone know how to make a backup MX server query the primary mx >> server if a mailbox exsists, before accept the contents of the mail? >> >> I have a problem with MAILER-DAEMON messages... >> >> Thanks > > That might not be the right problem to fix. If the primary mx is down, the > backup mx might not have anything to query. > > You might want to have the primary mx export a list of valid users > periodically as a text file, then have the backup server pick it up with > rsync, then postfix can use it to validate recipients.
Or, maybe: integrate both MXs to *one* user database, like LDAP, or *SQL, and have replication, then make the destination verification use that database, if the primary MX is death, the secondary will still have a valid, and up-to-date DB to verify its destinations. I hope this helps, Ildefonso Camargo
