Hello rmalmberg-glc, You can’t change the SMTP port that MDSM uses to send the email alerts as it is hard set.   Please let us know if you have any other questions.
My client wishes to enable email alerts for his PowerVault MD3200i; however, his email server requires authentication and uses a non-standard port.  I believe I can get around the authentication issue with a Receive Connector, but I cannot figure out how to change the SMTP port that MD Storage Manger uses.
MDSM Email Alert Port Change