mail mystery

[Bill Campbell]

On Tue, Feb 20, 2007, dep wrote:
>this isn't sendmail but it is mail and it is a mystery, and it's driven 
>me crazy for two months now.
>
>switched to satellite modem -- wild blue; had to, was on dialup max. 
>26.4 with no hope of wire ever actually getting out here. and what 
>everyone here said when i was preparing to move here more than two 
>years ago is right: dialup is the only thing satellite is better than.
>
>anyway.
>
>since switching to satellite i am having terrible difficulty sending 
>mail through one account. it goes fine through others, but this one 
>chokes -- usually times out after five minutes or so, then if i try 
>again it usually goes through.

I have a hunch that you're seeing propagation or perhaps DNSRBL
problems to that host.  This message appears to have originated
from IP 67.54.204.210, 67-54-204-210.cust.wildblue.net, which is
listed on dul.dnsbl.sorbs.net as a dynamic IP which would be
rejected by many mail systems.

We normally set our customers up who're on this type of dynamic
(or QWest single static IPs which are also considered residential
dialup by many ISPs including AOL) to use one of our servers as a
smart-host so they forward all outgoing mail through us.  We do
this using smtp over a port other than 25, largely to work around
broadband providers who block outgoing smtp traffic except to
their own mail servers.

These customer machines ``check in'' to one of our support
servers every fifteen minutes, and our system detects dynamic IP
address changes updating a mysql table which is used by postfix
to permit connections that might otherwise be rejected.

Bill
--
INTERNET:   bill at Celestial.COM  Bill Campbell; Celestial Software LLC
URL: http://www.celestial.com/  PO Box 820; 6641 E. Mercer Way
FAX:            (206) 232-9186  Mercer Island, WA 98040-0820; (206) 236-1676

The most serious doubt that has been thrown on the authenticity of the
biblical miracles is the fact that most of the witnesses in regard to
them were fishermen.
		-- Arthur Binstead