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Exchange 2013 - Junk E-mail List Size Limit

GlenV 61 Reputation points
2020-10-12T13:40:30.567+00:00

Hello,

We're running 'Exchange 2013' and have a user who is being presented with the message below in 'Outlook 2016'.

31580-junk.jpg

The user doesn't want to start deleting addresses from their current 'Blocked Senders' entries in Outlook because that would defeat the object of this facility.

Is there a way to increase the default size (510KB) of the Junk E-mail lists for this user?

Any help gratefully received.

Kind regards,

Glen

Exchange | Exchange Server | Management
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  1. Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator
    2020-10-12T13:49:41.497+00:00

    Nope, there is no way to increase that. They will have delete some of those entries if they want to add more.

    Raising the max allowed rules only works in versions older then Exchange 2013:
    https://learn.microsoft.com/en-us/outlook/troubleshoot/junk-email/outlook-error-over-junk-emial-list-limit

    P.S. If you are wondering why that is, large allow and block lists are very expensive to process from a resource perspective. Once the store was changed in 2013 along with the migration of emphasis to Exchange Online, a hard limit was placed on the number of allowed entries.

    Possible Work-Around:

    Have the user create an Outlook rule instead that deletes or moves the message based on the sender:

    31679-image.png

    Then increase the rules quota for that mailbox to its maximum if not already set: 

    set-mailbox <user> -RulesQuota 256KB

    https://learn.microsoft.com/en-us/powershell/module/exchange/set-mailbox?view=exchange-ps

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  1. Yuki Sun-MSFT 41,376 Reputation points Moderator
    2020-10-13T05:59:16.357+00:00

    Hi @GlenV ,

    Andy has shared a great official article about his and hopefully you can find that helpful:
    Outlook error indicates that you are over the Junk E-mail list limit

    As mentioned in the article, the Max Extended Rule Size registry value does not apply to Exchange Server 2013 so it's now not feasible to increase the default size (510KB). Given this, please have a check and try to disable the "Trust e-mail from my Contacts" setting in Outlook if the user in question is currently having it enabled:
    31856-1.png

    With the above setting confirmed, you can download the MFCMAPI tool and check the PR_RULE_MSG_STATE property using the steps in the article.

    If the error still persists, then it's likely this is due to the large number of entries in the Junk E-mail lists, you'll then have suggest the user to deleting some entries or using workarounds like creating Outlook rules as provided by Andy.

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