You may wish to move your blocked senders list from medschl email to Exchange Online. This will not happen automatically and will need to be done manually after your mailbox has been migrated.
How to move your Blocked Senders list
To do this you need to have access to your medschl mailbox in Outlook
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Open up Outlook
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Click Home > Junk > Junk E-mail Options
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3. Open the Blocked Senders tab and click Export to File. Choose a location to save the file, name and save it.
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You will now have a .txt file that you can use to create new blocked senders in Exchange Online
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Go to Exchange Online https://outlook.office.com/mail/ in a web browser
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Click on the gear icon near the top right of the window
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Click View all Outlook Settings at the bottom of the Settings pane.
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A Settings pane will then appear.
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Click on Junk email
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Click + Add
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Open up your text file of blocked senders
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Paste in an email address and hit the enter key on your keyboard
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If you receive email that you think is spam or phishing messages you can report them so that any further email from that sender are removed and they are reported so that they are investigated and blocked for everyone.
In Outlook
To report a message in Outlook:
Click on the message to select it
Click on the Report Message button on the Ribbon
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Choose an action from the drop down menu:
Junk - for any spam or junk email that should not have made it through to your inbox choose this option
Phishing - if you think the message is trying to lure you into clicking on a link or opening an attachment choose this option
Not Junk - if you notice a message in your Junk folder that is a legitimate message, you can indicate that it is not junk so that it is not blocked in future.
In Webmail
To report a message in Webmail:
Right click on the message and select Report
Choose Report Junk or Report Phishing as appropriate
Other Information
For information on managing junk mail and blocked senders generally please see this page - Junk Email Filter