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Maximum entries Spam filter allow list
I work at a school and we have a Spam filter policy activated in Exchange Online. We notice that sometimes some emails from parents are seen as bulk mail. By adding them to the allow list of the spam...
- Correct, exchange online protection limit for Allow List is 1024 entries.
https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-protection-service-description/exchange-online-protection-limits
You could
1.) Shrink the list by identifying similar domains and add the domain instead of each individual addresses
2.) Do the same for IP's for well known services (I.e. Outlook, GMail)
3.) Consider a third party gateway with a higher allow list
AFAIK there is no way to raise this limit. There is a uservoice open for this, but looks like its been some time and not been picked up.
https://office365.uservoice.com/forums/273493-office-365-admin/suggestions/11138919-allow-us-to-increase-the-size-of-the-junk-mail-sa
Hope that answers your question.
Best, Chris
Something else you can try is to add them to "bypass spam filtering" Transport rule, however there are limits there as well. Maybe change the default "bulk" action to quarantine, and then review the quarantine at regular intervals to release any parent's messages?