Problem with delayed email

[jim54481]

One of the users on our exchange server has two email addresses. When he receives email to his secondary user and tries to respond, he always gets a message back after several hours that the email has been delayed. If he were to create a new message, it goes through without a problem. Any ideas on how to correct this?

 

[gavm99]

Does it actually get delivered after you get the delay message?

Gavin Moorhouse

http://www.lucidcomputersolutions.co.uk

 

[jim54481]

Actually, it does, which is really confusing.

 

[gavm99]

Ok so lets concentrate on one of the email addresses you have had problems sending to.

What happens if the user sends this person a new email message?

What happens if you send this person a new email message?

Thanks.

Gavin Moorhouse

http://www.lucidcomputersolutions.co.uk

 

[jim54481]

If the user sends the person a new email, it goes through. If I send the user a new email, it goes through. If either of us sends a reply, it does not go through, but returns with a undeliverable with the following:
Could not deliver the message in the time limit specified. Please retry or contact your administrator.

 

[gavm99]

Do you have one public IP address?

What does your Reverse DNS point to?

Thanks.

Gavin Moorhouse

http://www.lucidcomputersolutions.co.uk

 

[jim54481]

We have one public IP address and do not have a reverse DNS. I have been working to get that changed.

 

[gavm99]

Ok, well that is interesting as I have seen similar problems with customers who didn't have correct reverse DNS, I wonder if the fact that you have no reverse DNS is the issue here.

I suspect it might be as some mail systems will delay or reject mail if the reverse DNS isn't correct.

I think this is something you should look at as I suspect this isn't a local Exchange issue.

Gavin Moorhouse

http://www.lucidcomputersolutions.co.uk

 

[58sniper]

You're required by RFC to have a reverse DNS entry, IIRC.

Pat Richard
Microsoft Exchange MVP
Contributing author Microsoft Exchange Server 2007: The Complete Reference

 

[jim54481]

Thanks for the input. I have it running, should take about a day to sync, then will test.