Re[4]: [cobalt-users] DNS reverse address lookup, Raq3i

[COMPUTICA <cobalt@xxxxxxxxxxxxxxxxxx>]

On Tuesday, October 29, 2002, 8:47:21 PM, you wrote:

LS> On Tuesday 29 October 2002 08:14 pm, COMPUTICA wrote:
>> I am not sure if "it's needed", but I know it was in the DNS tutorial
>> I went through when first setting up DNS services on my RaQ's.  I have
>> never run any domains without both MX records....
>>
>> Maybe someone else can let you know if it's needed to not....
>>
>> If not....this thread has taught me something today that will save a
>> little bit of time down the road.....  :)

LS> If both "domain.com" and "www.domain.com" point to the same IP address then 
LS> _not_ only is it not needed - it is _not_ recommended and really 
LS> sort-of-kinda-almost- upsets admins such as myself who sit and watch a 
LS> message in queue until it "timesout" with the first MX host only to see it 
LS> connect to the exact same host as the second MX (and have to wait on that 
LS> timeout also)....  Really buggers up mail for remote people having two MX 
LS> records pointing to the same place...  Sort of like a voice mail that says 
LS> "dial 0 for help and if that doesn't work dial 0" (why would it work the 
LS> second time if not the first ??)

LS> Basic bottom line:  you need an MX record per domain.

LS> If "www.domain.com" resolves to an IP - then mail can be delivered there 
LS> anyway - since if there is no MX record for the domain portion of an address 
LS> - EG: someone@xxxxxxxxxxxxxx - then the sending server simply trys to "call" 
LS> that hostname directly.

That's some great info Larry!  Thanks!  :)

Ryan