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David Logan

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office 365 email host, exchange smtp and FQDN issues.

Hi Folks,

quick question. I ran the exchange trouble shooting analyser as i have had a few problems after a third party upgraded some of their software which uses our outgoing SMTP.

Out setup is as follows. (not ideal and soon to be upgraded)

Our domais are hosted by BT in the uk who use office 365. We have a catch all for our domain which is connected via a pop3 connection to BT's office 365 outlook online.

I now seems to have a SMTP and FQDN that dont match ans have has a feq DNR's over the past few weeks.

Our DNS is servername.internaldomain.local

Our SMTP FQDN is webdomain.org.uk

When I lookup our MX records online the point to webdomain-org-uk.mail.eo.outlook.com

Can anyone point me in the correct direction?
Avatar of Vasil Michev (MVP)
Vasil Michev (MVP)
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Catch-all mailboxes are not supported with Office 365. If your MX record points to the cloud, and the domain intent is set to authoritative, any message sent to non-existing recipient will generate an NDR.

You can instead point the MX to local email server, use it as catch-all and forward the messages to the BT account for storage.
Avatar of David Logan
David Logan

ASKER

Thanks. So would that allow me to work independently from BT? and control everything on my exchange fully.
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Avatar of Vasil Michev (MVP)
Vasil Michev (MVP)
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