>Problem #1: If you are running your own mailserver, you really should have >your own DNS server. At the very least, you could run a copy of BIND on >the IMail box.
Student Rob asked:
What's the downside of using the DNS server of our co location provider? The DNS box is one switch away.
There are several reasons:
[1] The first is that mailservers can use a lot of DNS traffic (especially if you are running anti-spam software). Because of this, some Internet providers may shut off access to the DNS servers.
[2] "Public" (supplied by your Internet provider for lots of people to use) DNS servers are more likely to be slow and/or compromised (with a poisoned cache),
[3] A local DNS server will normally have lower latency.
If you have a good Internet provider, and they don't have a problem with the level of use that your mailserver will require, you should be fine. But if you are using UUnet and get stuck with 198.6.1.2, you're going to encounter lots of problems. Given the relative ease of having a local DNS server (compared to what it takes to set up a mailserver), I would normally recommend people run their own mailserver. But, there are definitely cases where outsourced recursive/non-authoritative DNS (typically using the Internet provider's DNS servers) makes sense.
-Scott
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