In Thunderbird, go to File > New > Existing mail account
Enter your e-mail address and corresponding password. Then, it should auto-detect the configuration. If not, enter the following:
zimbra.univ-grenoble-alpes.fr
,SSL/TLS
,Normal password
smtps.univ-grenoble-alpes.fr
,SSL/TLS
,Normal password
Finally, click Done
.