Office 365/Outlook 2016 Email Encryption Option Suggestions - 5 User/Small Business

Hello. I'm wondering if anyone has suggestions for case by case email encryption options. It's for a small financial institution that will only require 5 seats. I've looked at the OME option however we find many firewalls block the Microsoft service and others require 25 seats. Virtru was one option we did fine but to customize the software it becomes pretty pricey. Any thoughts would be greatly appreciated. THX
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I've never heard of deliverslip. I usually would suggest to my clients who are FIs to use Ironport (or whatever Cisco calls it these days) or Voltage SecureMail.
But since you only need 5 seats - that's probably overkill.
OME would have been a good solution. I was just playing around with it and I like it. The emails marked as spam is probably from the links in the email - I don't think you can do much about people using aggressive spam detection.
https://docs.microsoft.com/en-us/office365/securitycompliance/data-loss-prevention-policies