Solved

Changed hosted exchange providers but some mail still going to old boxes

Posted on 2013-06-26
7
360 Views
Last Modified: 2013-09-25
We recently changed our name servers to point to Office 365 from an old hosted exchange server (over 72 hours ago).

We are noticing though that some mail is still being delivered to the old boxes...

We updated the name servers at our registar to point to the office 365 servers, and most new mail is arriving on the 365 server, but there still seems to be something strange.

Could it be propagation still??

If people on the internet respond to older messages from us (generated from the old server) will they route back to the old server? Could this be the issue?

Thanks,
Joe Cap
0
Comment
Question by:jcaprio
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
7 Comments
 
LVL 76

Expert Comment

by:Alan Hardisty
ID: 39279727
Some servers don't use MX records to send mail and other take ages to update themselves.

If you switched MX records to Office 365 - close inbound port 25 and then the mail that is arriving in the wrong place, won't be able to.

If people on the internet respond to older messages from us (generated from the old server) will they route back to the old server?  No - not possible.
0
 

Author Comment

by:jcaprio
ID: 39279739
but does that mean that the sender will receive a bounce back if I close port 25? and what about other pop/smtp accounts like gmail that user have set up in outlook? I do not want to block that traffic...
0
 
LVL 76

Expert Comment

by:Alan Hardisty
ID: 39279759
No - port 25 inbound allows other mail server to SEND mail to your server.  As you no longer want mail delivered to your server, close the port.

Anyone sending mail directly to your servers and not using the MX records (which are usually spammers), will eventually realise you don't accept mail there and lookup your current MX records and use those (as they should do).  No NDR will be sent unless they can't send mail for several days to any mailserver.

GMAIL / POP account will collect mail from external sources, so closing port 25 inbound will have no bearing on those accounts at all.
0
Webinar: Aligning, Automating, Winning

Join Dan Russo, Senior Manager of Operations Intelligence, for an in-depth discussion on how Dealertrack, leading provider of integrated digital solutions for the automotive industry, transformed their DevOps processes to increase collaboration and move with greater velocity.

 

Author Comment

by:jcaprio
ID: 39279896
ok, so if we were using a hosted solution I would have to contact that company to do this, correct?

Or is this something we do on our router?
0
 
LVL 76

Expert Comment

by:Alan Hardisty
ID: 39279938
If you are using a hosted solution, then you need to remove the mailboxes from that solution - they won't block port 25 for you.

Once the mailboxes are removed, then no more mail will arrive there.

It is possible that mail is arriving from companies using the same hosting provider (so it is seen as internal mail), which would explain why it isn't using your MX records to direct the mail.

Alan
0
 

Accepted Solution

by:
jcaprio earned 0 total points
ID: 39510527
there was a forward from another domain that was causing the issue. Resolved.
0
 

Author Closing Comment

by:jcaprio
ID: 39520497
Solved it on my own
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

This guide is intended for migrating Windows 2003 Standard with Exchange 2003 to Windows Small Business Server 2008. You will need the following: Exchange Best Practice Analyzer: http://www.microsoft.com/downloads/details.aspx?FamilyID=DBAB201F-…
If you are a user of the discontinued Microsoft Office Accounting 2008 (MSOA) and have to move to a new computer running Windows 8, you will be unhappy to discover that it won't install.  In particular, Microsoft SQL Server 2005 Express Edition (SSE…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

739 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