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Exchange 2000 not getting all e-mails

Posted on 2003-10-27
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Last Modified: 2010-05-18
Hi,

Using Exchange 2000 server on a Windows 2000 environment.
I just moved my external e-mail in-house. My ISP used to be the host.
Changed the MX records - OK; opened the 25 port on my firewall-router 3COM - OK…. Everything went OK.. Can receive and send but we’re not able to receive from some people (one or two). And we cannot send to AOL e-mail addresses.

When I set up my firewall to open port 25, I also open POP3 maybe this was wrong?...

Any ideas?.

Thanks
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Question by:lunanat
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by:vivekpara
ID: 9629004
You may have to forward all mail to your ISP's for outbound(outgoing) mail.  Some hosts, like AOL and Adelphia, check that the reverse lookup for the address matches the senders email IP address.  If your internal Mail Server is firewalled, I would guess you have NAT addressing and the internal mail IP address is listed as the originating IP address.

By forwarding to your ISP, outgoing mail will be addressed as from your ISP's address and should pose no problems to you.

People who are having trouble SENDING you mail is a more involved problem.  It might be that addressing is not correct (have them try sending you an email and have them cc to an address OUTSIDE your network like a hotmail account).  This is a good way to see that they are addressing it correctly as well as see if their mail server may be the problem).

Let me know what you find out from that.

Good Luck!

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wallew earned 250 total points
ID: 9629886
We had the same problem.  A quick call to the ISP corrected it.  Ask them to enter a reverse lookup record for your mail server.

You can also use the ISP's SMTP server to forward.  I just like having control.

Wallew
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by:vivekpara
ID: 9629975
Wallew is correct if you have a publically available mail server.  If the address is a firewall proxy, this may not be an option for you.
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by:lunanat
ID: 9851019
Thanks...
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