Custom email bu deleting all links

Hy everybody,

I am network administrator, and I have a Nexcloud in production for our users, in intranet.

I’d want to custom sent emails in order to delete all links sent to users.
Why ? because we have so much attacks with fake emails with links to click.
So for our users, the rule is simple : don’t click on links on emails.

I can’t implement NextCloud with emails for my users, with links. So I search a solution.
I saw we can custom emails with a function, but I suppose there is a generator of links independent ?
Can you say me if with custom finction email, I can delete ALL links ?

Un petit up.
Personne n’aurait une piste ? :-/