LOGIN
$ telnet imaphost 143 Trying 18.67.13.317... Connected to imaphost. Escape character is "^]". * OK 01 LOGIN username password 01 OK Logged in.
AUTHENTICATE PLAIN
$ perl -MMIME::Base64 -e 'print encode_base64("\000username\000password");'
AHVzZXJuYW1lAHBhc3N3b3Jk
$ telnet imaphost 143
Trying 18.67.13.317...
Connected to imaphost .
Escape character is '^]'.
* OK
01 AUTHENTICATE PLAIN
+
AHVzZXJuYW1lAHBhc3N3b3Jk
01 OK Logged in.