How to Route Mail to Multiple Relays

[PortalCasting]

I would like to configure sendmail to route mail to a domain via two different mail servers (say mail.host.com and backup-mail.host.com). Is there a way to do this? I have looked at modifying the virtualusertable as well as the alias file, but I have not come up with anything yet. Any help would be appreciated.

Thanks
Mark

 

[Weppie]

I think you'll have to change the MX records of the DNS server to do that.

you could for example enter in the zonefile of host.com

IN MX 10 mail
IN MX 10 backup-mail

setting the same priority (10) will enable some sort of round-robin loadbalancing...