[pkg-fetchmail-maint] Bug#700266: fetchmail: --sslfingerprint uses MD5

[Matthias Andree]

Thanks for mentioning this.

This will not be fixed in a 6.X version for compatibility reasons.
(I might fix the manual page for 6.3.25 though.)

I am not tagging "wontfix" because I do intend to fix this for the
future 7.0.X series.

We'd also need to add support for multiple fingerprints (for failover
configurations) at the same time.