<div>
Hi Sam,<br />
<br />
Which migration approach you are using?
</div>


Hi Sam,

Which migration approach you are using?

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The blacklist is not with Microsoft but with Spamhaus, as the message above shows. That's where you should unlist it and potentially get an answer why it was blocked.
</div>


The blacklist is not with Microsoft but with Spamhaus, as the message above shows. That's where you should unlist it and potentially get an answer why it was blocked.

SAM2009

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<div class="content wysiwyg-content">
Hi,<br />
<br />
I'm in process to migrate my users mailboxes from Exchange 2007 to O365.<br />
<br />
I set a Send Connector rule to send all emails for migrated recipients to O365 MX server. Now &nbsp;I got a msg from O365 like:<br />
<br />
mail.protection.outlook.co<wbr />m #550 5.7.1 Service unavailable, Client host [x.x.x.x] blocked using Spamhaus. To request removal from this list see <a href="http://www.spamhaus.org/lookup.lasso" rel="ugc">http://www.spamhaus.org/lookup.lasso</a><br />
<br />
Why my Hub Transport is considered as spam? How can I whitelist my server in O365?<br />
<br />
Thanks
</div>
</div>


Hi,

I'm in process to migrate my users mailboxes from Exchange 2007 to O365.

I set a Send Connector rule to send all emails for migrated recipients to O365 MX server. Now  I got a msg from O365 like:

mail.protection.outlook.com #550 5.7.1 Service unavailable, Client host [x.x.x.x] blocked using Spamhaus. To request removal from this list see http://www.spamhaus.org/lookup.lasso

Why my Hub Transport is considered as spam? How can I whitelist my server in O365?

Thanks

How can I whitelist my  mx server in O365?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.