need ideas: why arent emails reaching aol/bellsouth?

[ZippyDan]

im trying to help out a friend who has outlook 2k3 on all his computers hooked up to a central ms exchange server. email works to everyone except some domains like bellsouth and aol. outlook shows the email sends successfully, but my aol mailbox never receives the email. it is not showing in aol's spam mailbox either

this is a vague question, but can any give me some ideas as to why email would not be reaching some common domains like bellsouth or aol? perhaps the exchange server is filtering them somehow?

 

[Looney]

Is he getting the emails bounced back to him?

 

[ZippyDan]

sort of. we're getting the following response after a day or two for each email going to these certain domains (i think it doesnt like earthlink either)

---------------------

From: Administrator

To: Me

Subject: Delivery Status Notification (Delay)

This is an automatically generated Delivery Status Notification.

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipients has been delayed.

whatever@curseddomain.com

----------------------

the email never arrives...

edit: it looks like this may be similar problem/solution http://www.experts-exchange.com/Network...upware/Exchange_Server/Q_21121364.html

 

[ZippyDan]

ok, after determining that reinstalling exchange 2k3 on sbs is somewhat of a pain, i also found that many domains like aol, bellsouth, and earthlink do not accept email from domains that are missing reverse dns info. http://72.14.203.104/search?q=cache:JIj...elay)+domain&hl=en&gl=us&ct=clnk&cd=14 now that i know that might be the problem, i am trying to figure out how to fix it.

i also found that a similar problem could be caused by antivirus software on the server http://support.microsoft.com/default.aspx?scid=kb;en-us;842801 but i dont find the registry key it speaks of on my server

 

[Joemonkey]

is the mail stuck in the queue? if so, and you click on it, what does it say the problem is?

and yes, PTR records are required

 

[ZippyDan]

ok, the domain is registered through godaddy

since he runs his own exchange server off a dsl connection, the mx server in godaddy account settings is set to a homeip.net (dyndns) address. with this mx server dnsreports.com was telling me that reverse dns was failing

i changed the mx port back to the default godaddy settings and within an hour (after some dns propogation), dnsreports was telling me that reverse dns was passing. well i still couldnt send email to my email account but i dont know if the updated info had propogated enough

unfortunately without the exchange server as the mx account, we stopped receiving all mail as well, so i had to set the mx settings back to how they were

except now that ive done that, we still arent receiving any external emails. sigh

so basically now i need to know why my settings have stopped all incoming mail (no mispelling and its had 2 days to propogate)

after i fix that i need to know how to setup reverse dns entries on a dyndns dsl connection running an exhcange mx server

after that i need to figure out if that is even the cause of the original problem



edit: dnsreports = dnsreport.com