So... as far as I can understand, there is a big mess on our server. We actually have two different versions of PHP : 5.3 and 7. And vBulletin is using 5.3 which is not supported any longer. As our server uses PHP 7 for e-mails, it doesn't do the link between vB and the mail server...
I now have to plan cascading updates for vBulletin and PHP to make things right and only then make further mail tests.
I hope this will be sufficient.
Sorry for the disturbance and thank you again Snakes1100 for your help! I'll post news when I get some.
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