Vidol Loeung wrote: > I tried to stop the mail service on mail1.mydomain.com, expecting that > from then on, whenever there is mail for the domain, > mail2.mydomain.com should be the one to receive and queue that mail. > Yes, it actually did; however, I got the error 553 (system config > error): "mail loops back to me (MX problem)". > > Both my mail servers mail1 and mail2 run Sendmail in RH9.0 and they > both point to ns.mydomain.com as their DNS server, which runs BIND > also in RH9.0. > > Please, you have any clues to the problem? After reading this entire thread, I'm confused as to your final goal. In your first post, you seem to be asking about configuring two active mail servers sharing a common mail storage (like Network Attached Storage, NFS, etc...). The replies to this thread seem to address viable options along with pointing out the pros/cons of each. Now you seem to be configuring one primary mail server with a secondary mail server that simply queues mail should the primary go off-line. My response addresses the latter. First, your DNS entries look fine. The "Loops back to me" problem is related to your sendmail configuration on the secondary mail server. If your goal is to simply queue e-mail on this server until the primary comes back on-line, then your will need to use sendmail's mailertable feature. Using the info you have supplied in your post, simply add the following (see below) to your /etc/mail/mailertable and /etc/mail/relay-domains files on mail2. Then type "make" in /etc/mail to recompile the mailertable database. Since your editing a non-database file (relay-domains) you will have to restart sendmail. # cat /etc/mail/mailertable mydomain.com esmtp:[mail.mydomain.com] and in /etc/mail/relay-domains #cat /etc/mail/relay-domains mydomain.com The above configures sendmail to relay any e-mail addressed to mydomain.com to mail1.mydomain.com using the esmtp mailer. The brackets around mail1.mydomain.com tells sendmail to ignore the specifed MX records for final delivery. Which BTW is causing the "loops back to me" problem. Obviously, you do NOT want mydomain.com listed in /etc/mail/local-hosts-names. Further reading should include /usr/share/sendmail-cf/README. This is basically the sendmail man pages. Steve Cowles -- Shrike-list mailing list Shrike-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/shrike-list
