Not getting all email

[htechhost]

Ok I have a question not sure what the issue is. I have a working 2003 exchange server. For the most part it seems to be receiving email. I do tests with several domains and they all seem to work. Every once in a while I run into a couple people who send messages and I never get them. Or I get them very delayed like several hours. There are no failure messages. I have done all the online tests and it says the mx record is fine. I suspect that the servers having issues are unix or linux servers because I know of one person whos company has one and I can never get the mail and it comes several hours later. I don't have an email gateway...just a straight exchange server. I suspect its setup correct since I can get mail. I checked the black lists and I'm not on any..don't send spam. ; ) I'm stumped.

 

[xmsre]

Check your dns at

http://www.dnsreport.com

Make sure you have a PTR record in your external DNS.

 

[htechhost]

That checked out ok. I did find this:

WARN: One or more of your mailservers does not accept mail in the domain literal format (user@[0.0.0.0]). Mailservers are technically required RFC1123 5.2.17 to accept mail to domain literals for any of its IP addresses. Not accepting domain literals can make it more difficult to test your mailserver, and can prevent you from receiving E-mail from people reporting problems with your mailserver. However, it is unlikely that any problems will occur if the domain literals are not accepted.

Would this cause some mail to not come through?

 

[jmandiaz]

htechhost,
sounds like a DNS problem more than likely your domain is resolving can you do a reverse lookup on your domain/ip?

 

[PuzzledUNIX]

This warning error is nothing. Just ignore it...
Just make sure DNS is running right.(zones)
Regards,

 

[htechhost]

I did a reverse lookup and it points back to my internet connection (DSL network). Maybe that's the problem with some mail servers don't accept dsl. Is there a way I can add a reverse lookup if the ip is registered to my isp? I have colocated servers that run web and dns but wanted to put this box in my house so I basically have dns pointing to this ip for mail and setup all the dns information.

 

[htechhost]

I called my isp and they put reverse dns for the ip address and I think it has fixed the problem. I'm getting a lot more mail now.

 

[dearingkr]

I had this same problem.

The issue is that your DNS MX record is supposed to refer to a FQDN (mail.mydomain.cm), NOT an IP address.

Fix:
1. change your MX record to mail.mydomain.com
2. Create a record for mail.mydomain.com that points to your IP address.

 

[htechhost]

dearingkr

Thanks! I will try that and see. Got the reverse dns working but I still don't think I'm getting all mail. It's wierd how some works and some doesn't.