Exchange rule block HTML still quaratining emails from specific senders

Question

Exchange rule block HTML still quaratining emails from specific senders

Birhanu Kassa 41

We have a block all HTML Exchange rule for exchange online. I added an exception for 3 specific sender is (the external users email addresses) but emails are still being quarantined because of the HTML rule.

Priority is set to 51 & the emails are whitelisted on the O365 defender Spam policy as well.

When investigating via exchange message trace & message explorer the reason for quarantine says because of the exchange rule HTML, but when looking at O365 explorer I see a all overrides, Allowed by organization policy : Sender address list (Safe sender / Blocked sender), but when looking in the details it says messages may or may not be effected.

Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-09-22T02:29:39.877+00:00

Hi @Birhanu Kassa ,
I wonder how did you add the exception for the external users? Are they in the rule of block html?
If possible, please provide the screenshot about the rule of block html that in your organization and the screenshot about the exception for the external users , so that we can do better research.
(In order to avoid the disclosure of your privacy, please remember to hide your personal information).
Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-09-27T08:12:59.077+00:00

Hi @Birhanu Kassa ,
It has been a few days and I am checking in to see how things are going on with this issue. Does this issue have any updates?
Birhanu Kassa 41 Reputation points

2022-09-29T14:15:48.667+00:00

Yes they are added as exceptions on the Block HTML rule. Rule is as follows below:
Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-10-07T09:49:51.467+00:00

Hi,
Sorry to reply late.
I wonder how do you set the “except if”?
Is the sender the full address? Please try setting only one sender to see if it sends messages is blocked.

1 answer

Your answer

Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-09-22T02:29:39.877+00:00

Hi @Birhanu Kassa ,
I wonder how did you add the exception for the external users? Are they in the rule of block html?
If possible, please provide the screenshot about the rule of block html that in your organization and the screenshot about the exception for the external users , so that we can do better research.
(In order to avoid the disclosure of your privacy, please remember to hide your personal information).
Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-09-27T08:12:59.077+00:00

Hi @Birhanu Kassa ,
It has been a few days and I am checking in to see how things are going on with this issue. Does this issue have any updates?
Birhanu Kassa 41 Reputation points

2022-09-29T14:15:48.667+00:00

Yes they are added as exceptions on the Block HTML rule. Rule is as follows below:
Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-10-07T09:49:51.467+00:00

Hi,
Sorry to reply late.
I wonder how do you set the “except if”?
Is the sender the full address? Please try setting only one sender to see if it sends messages is blocked.

Answer 1

04942077 1

Sender address was not the full address (I was using send-on behalf address)

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Exchange rule block HTML still quaratining emails from specific senders

1 answer

Your answer