Authentication of EPFL email
The EPFL mail servers will refuse emails wiht an @epfl.ch sender address (in the "From: " header), unless the connection is authenticated with the corresponding account. The goal is to garantee the authenticity of firstname.lastname@example.org sender addresses: when you receive in your EPFL mailbox a message from an EPFL member, you will be certain that he/she is really the sender (and the same will apply for "services" addresses).
To reach that goal, all EPFL users must use authenticated connection to send their messages.
What do I have to do ?