Block DisplayName rule

[MindeaLLC]

I would like to setup an org-wide Exchange Rule on a 365 tenant that prepend's the email.

1. inbound-from-external domain
2. where the DisplayName = "John Doe"

I've tried several iterations but can't get it to work. For example, this doesn't work:

Rule description
Apply this rule if

Is received from 'Outside the organization'
and sender's specified properties match these text patterns: 'DisplayName:John Doe'
Do the following

Prepend the subject with 'CAUTION CAUTION'

[#2]

If you need it only for your own mailbox, have a look at this freeware:
https://ivasoft.com/antispoofingflow.shtml
You have to modify the flow according your needs.

[#3]

Thanks for the suggestion, but I need it organization-wide on a 365 tenant.

[#4]

Then try to use "A message header includes" instead of "sender's specified properties match these text patterns" - see https://learn.microsoft.com/en-us/exchange/security-and-compliance/mail-flow-rules/conditions-and-ex...

[#5]

Thank, Victor. At your suggestion, I tried a couple of attempts at "A message header includes..." over the last couple of hours without success. Now I'll study the document you sent and try again. Will let you know.

[#6]

Also have a look at this: https://community.spiceworks.com/topic/2270840-ms-exchange-rule-based-on-sender-name

[#7]

Finally got it working. See below.

I appreciate the input.

[#8]

Wow, great!