$fetchmail  -u $USERNAME imap.mail.yahoo.com --ssl --port=993
Enter password for $USERNAME@imap.mail.yahoo.com:
2000 messages (8 seen) for $USERNAME at imap.mail.yahoo.com.
fetchmail: Connection errors for this poll:
name 0: connection to localhost:smtp [::1/25] failed: Connection refused.
name 1: connection to localhost:smtp [127.0.0.1/25] failed: Connection refused.
fetchmail: SMTP connect to localhost failed
fetchmail: SMTP transaction error while fetching from $USERNAME@imap.mail.yahoo.com and delivering to SMTP host localhost
reading message $USERNAME@imap.mail.us.am0.yahoodns.net:1 of 1648 (3507 header octets)fetchmail: Query status=10 (SMTP)