Real exit capability can differ from exit policy (SMTP over TLS )
Exit nodes can set up their own exit policy but sometimes they are not able to really exit traffic on all the allowed port. This issue is for the followup of probes creation to assess this problem. The aims is to be able to inform node operator to solve the issue or adapt their exit policy.
For easier review, this issue is focused on SMTP over TLS (e.g. port 587)