feed2imaprc is feed2imap's configuration file. It is usually located in ~/.feed2imaprc.
Examples
See /usr/share/doc/feed2imap/examples/feed2imaprc.
Reserved characters
Some characters are reserved in RFC2396 (URI). If you need to include a reserved character in the login/password part of your target URI, replace it with its hex code. For example, @ can be replaced by %40.