If you’re using fetchmail with Mutt usually you have to keep your password in a plaintext configuration file. msmtp has a
passwordeval option, but fetchmail doesn’t. Aside from patching fetchmail itself you’re pretty much out of luck.
However, there is a clever trick where you can generate the configuration on the fly.
Keep your email password in a GPG encrypted file called
.pswd.gpg. The following command will then generate a configuration file from your existing
.fetchmailrc with the password field appended to it and feed it to fetchmail.
echo "pass '`gpg -dq .pswd.gpg`'" | cat .fetchmailrc - | fetchmail -v -f -
.muttrc the following binding will get new mail.
macro index,pager I "<shell-escape> echo \"pass '`gpg -dq .pswd.gpg`'\" | cat .fetchmailrc - | fetchmail -v -f - <enter>"
In Mutt the “I” key should now activate fetchmail.