use message filters to avoid dataloss with outlook autocomplete

[civas]

In order to prevent outlook autocomplete to wrognly send to external recipients internal mails, we would like to implement the following solution using ESA message filters.

When sending to an external recipients, the user must enter prepend a text such as "public:" in the mail subject.
Esa checks the presence of the text, if present removes it and sends the email if not present it does not send the email.

Is this supported or does someone have another solution?

Thanks.

[Ken Stieers]

There are a couple of places you can do this: as a message filter, or a content filter.

For ease of support, a content filter is easier…

In Mail Policies/Outgoing Content Filters create 2 filters

The first one looks for public, an if its MISSING, bounce the email as a final action.

The second one would just strip the Subject line of the word public.  See screen shots below.

This is a little draconian... so be careful with what you're doing here...