Question

Email problems

Asked by: Vardata

We started having email issues today when we found out we were on the XBL spam list. While we were on the list, we were getting NDR's from some customers stating the email was rejected because we were on the list, but others were receiving emails no problem. After I cleared our address from the list, we were unable to send to any recipients.  So I waited for a few hours to make sure it wasn't a lag in everyone catching up with the XBL database. Unfortunately, I still cannot send email to anybody!  Internal emails are delivered immediately, but anything going outside is held in the queue until it times out. This is not a new server. This has been working for many years without any problems. Does anyone have any suggestions? I don't know what else to do.
I appreciate any help you can give .

Thanks,
Matt

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Asked On
2008-07-01 at 15:23:08ID23531919
Tags

Microsoft

,

Exchange 2003

,

Cannot send email out of Domain

Topics

Exchange Email Server

,

Simple Mail Transfer Protocol (SMTP)

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: jenkinsmePosted on 2008-07-01 at 15:26:06ID: 21912114

Is your server its own SMTP server or are you using a smarthost to send outgoing mail?

 

by: VardataPosted on 2008-07-01 at 15:47:46ID: 21912226

my server  is its own SMTP server

 

by: VardataPosted on 2008-07-01 at 15:48:50ID: 21912234

if i do nslookup from the outside it shows the correct information. when i do nslookup internally, it gives me my ISP's DNS server address.

 

by: jenkinsmePosted on 2008-07-01 at 15:59:36ID: 21912291

That would be a place to start check and make sure dns settings internally have not somehow changed. It should list your DNS Server name then ip address and then list your smtphostname and the valid public ip address to your server.

 

by: VardataPosted on 2008-07-02 at 05:29:30ID: 21915591

I still cannot send email out. When I do an nslookup this is what I get...

c:\nslookup
Default Server:  ns1.myisp.net
Address:  xxx.xxx.xxx.xxx  -  my ISP's DNS

> mail.mydomain.com
Server:  ns1.myisp.net
Address:  xxx.xxx.xxx.xxx  -  my ISP's DNS

Non-authoritative answer:
Name:    mail.mydomain.com
Address:  xxx.xxx.xxx.xxx  - My public IP address

>server 'server ip address' - this is my Exchange/DNS/DC/etc... server
Default Server:  [192.168.2.252]
Address:  192.168.2.252

>mail.mydomain.com
Server:  [192.168.2.252]
Address:  192.168.2.252

Name:    mail.mydomain.com

 

by: VardataPosted on 2008-07-06 at 07:47:31ID: 31472589

Jenkinsme,

Thanks for your help. It ended up port 25 was being blocked in our firewall after I made some changes.

20120131-EE-VQP-002

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