> Yes, some broken resolver/mail system combinations will bounce "No
> such domain" mail early rather than queuing "Host unreachable"
> mail.
Keyword: broken. We should fix broken software instead of kludging
our setup to work around a flawed situation.
> It's normally not an extra cost- either exchanging secondaries
> with another small company
You want to trust your domain(s) to another company? Placing full
trust in a system you can't assure is secure is definately a cost.
> or having your ISP host DNS
They're only known for being slightly inflexible without $$$.
> Finally, it's always a good idea to plan for robust and scalable
> infrastructure- that's one less thing to worry about if/when there
> are problems- instead of waiting for a new authoritative server to
> propogate
Perhaps your most valid point. However, for any non-transient
problems, all you have to do is remember to give sufficient time for
the new records to propagate.
We're getting a bit off track for firewalls@, though. Reply-To:
header set back to me.
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