We work with a giant company that prepends an email tag to every externally originating (to them) email that goes something like:
“Warning, this email originated outside your organization – don’t click any links unless you recognize the sender”
I don’t want to implement tagging exactly like this because 90% of all our mail flow is between us and this company. I’m worried the tagging would just become noise that gets ignored. (not to mention clutters email chains)
What I would like to set up instead would be tagging that only applies when an external account emails our organization for the first time For example, the tag would look like:
“Warning – you’ve never received an email from firstname.lastname@example.org before – Use caution if you were not expecting this email”
which I believe would be much more effective.
Does anyone know how to do this? Our environment:
On prem Exhchange 2013 / Proofpoint Spam Filtering