[Alpine-info] Preserve passwords setting?

[Baron Fujimoto]

I've installed Alpine using MacPorts on two different machines.  On one,
I answered [n] when prompted to preserve the password used to connect to
IMAP/SMTP servers.

    Preserve password for next login? [y]:

I can't find the setting or option that will reset or change this to [y]
though.  Can somone point it out to me?  Where are the passwords saved?
Are they encrypted?