UPDATE : SCU IT Service Center does not support unsecured apps like Mozilla Thunderbird. Click here to learn more.
You may need to use an alternative email client (Apple Mail, Mailbird etc.) to pull your IMAP/POP emails from SCU Google Email.
The solution below may or may not work for Thunderbird clients as of 3/1/2016
If you have changed your SCU gmail/Camino password successfully and can log into your SCU gmail account using a web browser, then you might want to use this help link to check you Thunderbird email account "saved passwords" are the same as your current SCU GMAIL password. If they are not the same, then the link below can guide you on how to reset your Thunderbird email "saved passwords" for both incoming (IMAP) and outgoing (SMTP) services.