On Wed, 25 Jun 2003, William Hubbs wrote:

>I have found that when I try to send mail to a certain isp from my linux 
>box, they bounce it and tell me that they will not receive mail from my 
>ipaddress because it is a dynamic/residential address.  I guess they are 
>attempting to block spam.

This is getting more and more common.  It used to be called the MAPS DUL 
(Dial Up List) and ISP's would block mail from machines that were in those 
lsits.

>Has anyone else run into this?  How are you getting around it?

Yes, I've noticed that AOL and Earthlink were either talking about doing 
it, or are doing in.  When I heard they were talking about it I configured 
sendmail to allow me to get around the problem.

I still wanted sendmail to be able to send directly to servers that I was 
sending too and not go through the Road Runner Mail servers (They can be 
overloaded at times and I get faster e-mail service to use my own outgoing 
server), while sending messages to those 2 domains through the roadrunner 
servers transparently.

In Sendmail this was an easy configuration:

First I made sure my sendmail.mc file had the following:

FEATURE(`mailertable', `hash /etc/mail/mailertable')dnl

to enable the mailertable in sendmail.

Then I created a /etc/mail/mailertable file with the following 2 lines:


aol.com         smtp:mail.rochester.rr.com
earthlink.com   smtp:mail.rochester.rr.com


(You would of course use your ISP's mail server after the smtp:)


Now you create the mailertable database:

makemap hash mailertable <mailertable

Then recreate your /etc/mail/sendmail.cf file from the mc file:

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

then restart sendmail and any messages going to aol.com or earthlink.com 
will now go through your ISP mail server, while any other messages will go 
directly to their destination.


HTH,

Christopher Fisk
-- 
Bender: "One of you will have to fill in for me while I'm gone." 
Professor Farnsworth: "Better yet, I'll build someone to fill in for you.
Some kind of gamma-powered mechanical monsters with freeway on-ramps for 
arms and a heart as black as coal..." 

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