Google Android 2.3 User Manual page 225

Email
Require sign-in
Username
Password
AUG-2.3-103
Check this option to enter a username and
password for your SMTP server, if your email
service provider requires that you enter them to
send email.
Your username on the SMTP server (this may
not be the same as your username on the
POP3 or IMAP server for incoming mail). Visible
only if Require sign-in is checked.
Your password on the SMTP server (this may
not be the same as your username on the
POP3 or IMAP server for incoming mail). Visible
only if Require sign-in is checked.
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Android User's Guide