Confusion about DNS for mail server

Posted by Tyron Gower on Server Fault See other posts from Server Fault or by Tyron Gower
Published on 2014-06-01T23:33:13Z Indexed on 2014/06/02 3:30 UTC
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dns

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email

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emailserver

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mx-record

We have migrated to Office365, everything is working except one company cannot email us as its connecting to our subdomains email server.

So,

We have companionsoftware.com.au hosted through office365 and all the required DNS entries. All seems to be working fine.

We then have a web server hosting our website companionsoftware.com.au and our subdomain email attachments.companionsoftware.com.au (pop3/smtp).

now for this one company when they try and email [email protected] it's connecting to STMP on attachments.companionsoftware.com.au.

Now attachments.companionsoftware.com.au and companionsoftware.com.au have the same ip address, but this is only affecting one person (that we know of) when they try and email us.

Have i configured something wrong or is it their server?

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