I am trying to forward emails that are fetched with
fetchmail to another SMTP host, which enforces
STARTTLS. I could not find a way to enable TLS in
fetchmail. Is this possible at all? If so, how?
It does not appear that
fetchmail supports TLS to the SMTP server. This is normally not a problem, as it usually delivers emails locally.
You can work around this by delivering to a local SMTP server and have it handle the delivery. If your don't need or want a full service server like
postfix, you can use a light-weight relay like
esmtp or 'msmtp` to deliver the mail.