Solved

Unable to receive email on Exchange server after changing ISP's.

Posted on 2013-01-13
2
518 Views
Last Modified: 2013-01-13
Hi,

I'm helping a company moving their network/server from one location to another.  They have also switched ISP's.  With the new ISP, they received a new static IP.  They have a Windows SBS with Exchange configured and are behind a Sonicwall firewall.  I have updated the firewall with the new static IP address info.  All computers have access to the internet and can send email but they are not receiving email.  I have contacted the hosting company and they have confirmed the MX record is correct, the same as the new WAN IP from the new ISP.  In midst of this change over, the hosting company had changed the port from I believe it was 587, not positive to 443.  I'm certain this is SSL.  Anyways, I changed the Sonicwall firewall rules to allow any WAN request to go to the internal server's IP addres.  Still not receiving email.  Am I missing something?

Thanks

Ted
0
Comment
Question by:TeddyZ83
2 Comments
 
LVL 58

Accepted Solution

by:
Cliff Galiher earned 500 total points
ID: 38772840
External email is always port 25 unless you were/are using a smarthost.

So use something like MXToolbox to make sure the MX record ACTUALLY got updated and propagated. And to test to make sure port 25 is not blocked by your ISP.
0
 

Author Comment

by:TeddyZ83
ID: 38772857
I had the host change the port number.  It was set to 443 but this was going to the internal web page.  They changed it to 587 and email is receiving now.
0

Featured Post

Edgartown IT Case Study

Learn about Edgartown's quest to ensure the safety and security of the entire town's employee and citizen data. Read the case study!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Follow this checklist to learn more about the 15 things you should never include in an email signature from personal quotes, animated gifs and out-of-date marketing content.
In-place Upgrading Dirsync to Azure AD Connect
In this video we show how to create a Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question