In order to use the department's authenticated SMTP service, you must have a department Kerberos password and an email client that supports both IMAP over SSL and SMTP over SSL. Remember that it's very possible that your outgoing (SMTP) password and your incoming (IMAP) password will be different. If you are having problems with this, contact staff@cs.umd.edu.
You should also import the CSD root certificate to allow your computer to trust certificates signed by the CS department. For detailed setup instructions, select your preferred mail client from the list below.