[Mailman-Users] Allowing user subscription for only my domain (particular domain) globaly

[JEHERUL]

Dear All,

I have configured mailman for my institute. But due to some security issue
I dont like to allow users to subscribe by other
email id (like gmail , yahoo ..etc). I only want users to subscribe with my
institute email id.

I am able to do this for a particular list using privacy option---> ban
list (using regex).

But I want to do it globally for all the list. How can I do it??

Thanking you for your time and sharing.

Regards
-- 
Jeherul Islam
Scientific Officer
Computer Centre
Indian Institute of Technology Guwahati
Guwahati-39
India
Office No :+91-361-258-3353