In order for your email to send properly, you must change your outgoing mail service to one of the McMaster’s. This is done differently depending upon the mail client you are using. Web-based email (ie, hotmail, gmail) does not require any changes. For all other clients, the outgoing mail server must be changed to: smtp1.mcmaster.ca Information on how to change the outgoing mail server for various email clients can be found here: https://www.mcmaster.ca/uts/email_accounts/email.html