Sendmail...

Derek Broughton news at pointerstop.ca
Mon Dec 24 03:01:27 UTC 2007


Hal Burgiss wrote:

> On Sat, Dec 22, 2007 at 08:40:44PM -0500, Paul wrote:
>> 
>> I guess I'm just wondering what sendmail is doing when my hostname is set
>> to foo.com as opposed to simply foo.
> 
> Its not waiting for a dns query to timeout (speculation ...).
>  
>> The mail goes out and reaches its target either way, but there is a 30-40
>> second delay when there is no .com
>> 
>> What advantages are there to getting a FQDN from DynDns?
> 
> Probably none other than it might workaround a nuisance issue.

Not entirely.  It's possible (and imo reasonable) for an MTA to check the
FQDN claimed by the sending MTA against its IP address, and reject email
where they don't match.  So you really should always have a valid FQDN.
-- 
derek





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