Computing Services does not allow clear-text authentication to servers on campus. This means that any email client used with Computing Services' email servers MUST be configured to use an authentication method that provides encryption of your password.
Before you open that attachment, remember that attachments in unexpected email messages or from unknown senders often harbor malware that could infect your computer. Fraudulent web addresses will lure you into providing your login credentials or personal information. Learn to recognize phishing attempts by taking an interactive Email Security training at https://cmu.wombatsecurity.com/modules/email/. You will be first directed to Web Login to access an online training platform, before you can select Email Security training.