Microsoft Exchange (Outlook) and Gmail Spam filtering functions are used to manage email spam. All emailed spam will be sent to the junk folder in Exchange or the spam folder in Gmail.  You can define blocked and Safe (allowed) senders using the tools available in your email account.

Exchange (Outlook): block sender or mark as junk

You may add entries to the Blocked and Safe senders lists in Outlook on the Web or the Outlook Desktop App for Windows.

If you use any other application to read your email (e.g. Outlook Desktop App for Mac, Apple Mail, Thunderbird, Android mail apps) we recommend that you use Outlook on the Web to manage your Blocked and Safe senders lists to ensure that the rules you define are saved in your Exchange account.

Exchange (Outlook): Manage your spam settings

You can manage your spam settings at https://outlook.office.com/mail/options/mail/junkEmail

Gmail: block senders

You can use an existing message to block a sender in GMail

Gmail: Options for managing spam messages

You can use these instructions for managing spam messages in Google.