Non-Email Account...

The customer has an inhouse mail server (MS Exchange) but I am hosting their Web site and their DNS. All of this works fine as long as the "Verify the existance of email senders" under the "Main >> Service Configuration >> Exim Configuration Editor" is unchecked. If this feature is enabled, they can not send email to any domain which is being hosted on the same server as their web site. The email bounces with the following error...

Gregory A. Miller on 1/11/2005 1:34 PM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<domain.net #5.5.0 smtp;550-Verification failed for <jmw@domain.net>>

(domain.net above was modified to prevent spam)

The exim_log shows the following...

2005-01-11 21:00:35 H=(domain.net) [206.81.245.136] sender verify fail for <jmw@domain.net>:
2005-01-11 21:00:35 H=(domain.net) [206.81.245.136] F=<jmw@domain.net> rejected RCPT <gmiller@mailtodomain.com>: Sender verify failed
2005-01-11 21:00:36 1CoYkO-0002rl-3g H=(domain.net) [206.81.245.136] F=<> rejected after DATA: there is no valid sender in any header line

Here is the DNS Zone information...

; Modified by Web Host Manager
; Zone File for lhlaw.net
$TTL 14400
@ 14440 IN SOA ns5.agbsm.net. gmiller.mailtodomain.com. (
2004102719
28800
7200
3600000
86400
)

lhlaw.net. 14400 IN NS ns5.agbsm.net.
lhlaw.net. 14400 IN NS ns4.agbsm.net.

lhlaw.net. 14400 IN A 206.81.245.136

localhost.lhlaw.net. 14400 IN A 127.0.0.1

lhlaw.net. 14400 IN MX 10 lhlaw.net.

mail 14400 IN CNAME lhlaw.net.
www 14400 IN A 65.16.99.55
ftp 14400 IN A 65.16.99.55
svr001 14400 IN A 206.81.245.136


The best I can figure is that Exim is testing against the local machine domain account which has NO email addresses and it just figures the message was forged and rightly rejects it. The question is... Can this be overcome without the obvious answer of turning off the sender verification option...? Can Exim be broken in a way that would affect just this single domain, might be another way to look at it?

Thanks, any input is appreciated...
-greg

 

Thank You, this worked beautifully...

-greg