On 29/May/10 16:42, Sam Varshavchik wrote: > PMC OS writes: >> Can someone help us with this problem please? > [...] > Your server should have access to stable DNS, in order for this to work > reliably. Alternatively, you can also explicitly set the primary server > in esmtproutes, in lieu of using a DNS-based configuration.
It is better to have a caching DNS almost dedicated to mail-related lookups, on the same or a nearby machine. You'll also use it for caching DNSBL replies (configure at least spamhaus.) > Note that your backup MX has no access to the list of mailboxes on your > primary MX. All mail for any address @ your domain will be accepted, and > the nonexistent recipients will be bounce from the backup MX. This will > generate backscatter, which should not really be much of an issue for a > backup MX. If you have decent connections, you are probably better off without backup MXes, except for exceptional magnetic storms, e.g. the Carrington Event, that may result in network failures spread around the globe. ------------------------------------------------------------------------------ _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
