Steffen Kluge wrote:
Only if it doesn't find one it can connect to, or if an error occurs after it did connect, the message will be deferred and retried, with notifications starting to go out after 4 hours, etc.
But as said before in this thread: properly configured MTAs will retry to deliver up to 5 days at least.
But not everybody wants to wait several days for their emails. Over here, people start jumping up and down if there's more than 30 minutes delay...
If the final destination is up, there won't be any delay unless some part of the Internet outside your control is down.
If the final destination is down, the users aren't going to get their email regardless of whether it's held on originators' servers or some secondary MX between,
Still haven't established (to my mind) the need for backup mail exchanges.
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Cheers John
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