From Wiki.voidnet.us
[edit] IMAP login
a login [username] [password]
A0097 LIST "" INBOX
A0098 LOGOUT
[edit] Sendmail issue where customer cannot send mail from mail client
TRUST_AUTH_MECH(`LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `LOGIN PLAIN')dnl
in the /etc/mail/sendmail.mc file