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

Posted on 2013-06-26
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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
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Question by:jcaprio
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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.
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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...
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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.
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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?
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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
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Accepted Solution

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

by:jcaprio
ID: 39520497
Solved it on my own
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