From: Andrew Culver aculver@uwo.ca Date: Thu, 18 Jan 2018 11:39:20 -0500
Some protocols use a protocol-specific command to begin TLS negotiation (STARTTLS for SMTP and POP3), so stunnel needs to know how (and be told) to use that command.
Phil,
General troubleshooting rule, always try for a most elementary, ordinary case before resorting to a special case.
Regards, ... Peter E.