I'm not sure I completely understand. You have a few domains that are hosted on a server at your home that has DSL for the connection and it's down? If that is the situation then once you change the MX records to point to another server just make sure that the server you are pointing to will accept mail for that virtual domain. Also make sure that you pull your MX records from the server that is down so when it comes back up there are no conflicts. I don't know sendmail.cf that well, I use Qmail here that hosts over 50 different virtual domains with no problems. If that doesn't answer your question then let me know.

At 02:56 PM 10/1/2003 -0400, you wrote:

My home DSL has been down for over 48 hours and it appears that it will be down for several more days. (I spare you the gory details). I am concerned about losing mail coming into various domains at that site.
That RH 7.3 machine runs mail/web/primary DNS for those domains.

I have modified the secondary DNS records for those domains (on a machine at my office - also on DSL) with an higher cost MX record pointing to a machine at the office also running RH 7.3 and sendmail, which I assume will pick up and queue the mail. The DNS TTLs are reasonably short, fortunately.

I've done this following O'Reilly/Sendmail book 2nd edition, but its not always crystal clear if you don't already understand it! Is there anything else I have to do on the backup machine (pointed to by the new MX records), particularly is there anything I have to do to its sendmail config files?

Any other pointers or "gotcha"s to this whole process?

Dick

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