Authentication problems - case-sensitive email id

[rathodsachin20]

When a user logs in using terminal as "abc@Umail.ucsb.edu" instead of "abc@umail.ucsb.edu"; the user gets logged in but submit shows "You cannot submit <project_num>" error.
Expected output should be either show login error or accept the submission after logging in.
A side effect: If user saves these credentials, it can never submit to any projects, unless the credentials file is deleted.