[Koha] Koha 21.11.10 version, New Patrons email notice sending problem.

[MASTeR Library]

Good morning, I'm looking for tips to solve a New patron email notice
sending problem. I noticed that Koha 21.11.10 version, New Patrons email
notice only does not send, But book check-in, check-out, book renewal
notification etc are working properly.
-- 
 Thanking you..

Librarian,
MAMCET <http://mamcet.com/>
Trichy-Chennai Trunk Road,
Siruganur, Tiruchirappalli-621 105.