Exchange Email not getting to some destinations

[milfordboy]

I have set up Exchange to send and receive email from my ISP using the POP3 connector, and to send out via SMTP.

It works to some domains, but not others. First of all when I was told that an email wasn't received, I didn't believe it! I have tried various domains - gov.uk, co.uk, com etc and yes it is true, some didn't work!

Any ideas of what the problem could be? I thought with this kind of configuration everything be straight forward!

 

[58sniper]

If you have a static IP address, you should use POP3.

Next, run an RBL test and a reverse DNS test at dnsstuff.com

Pat Richard, MCSE MCSA:Messaging CNA
Microsoft Exchange MVP

 

[PaulGillespie]

Had this issue a few times. The way i get past it is to creat a new custom SMTP connector. Add in the domains to this connector that you can't deliver to and set it to use the smarthost of your ISP.

More than likely that your emails are being rejected as spam with no NDR.

 

[58sniper]

Whoops - just realized my reply should have read "you should NOT use POP3".

More than likely that your emails are being rejected as spam with no NDR.

If that's the case, you need to find out WHY, and resolve THAT, rather than using a smarthost as a work around. Using smarthosts has it's own set of problems as well.

Pat Richard, MCSE MCSA:Messaging CNA
Microsoft Exchange MVP

 

[PaulGillespie]

Agree. Possibly down to using pop3 for download and smtp for sending.

Had this issue a couple of days ago where emails to AOL bere not getting through. We were on no black lists, emails were plain text etc without attachments. set to aol emails through a smart host and they went fine. AOL tech support were useless and we were none the wiser to the reason.

 

[ShackDaddy]

AOL tends to block email for two reasons:

1) Lack of a PTR/RDNS record for your sending mail server.
2) Your server IP address is known to be in a block of addresses that are marked "dynamic" in someone's database of such things.

Using a custom connector to deliver mail to AOL through a smarthost at your ISP is probably the easiest way to resolve this. I haven't had any success at being removed for reason #2, although creating a PTR record is also fairly simple.

ShackDaddy
Shackelford Consulting