Issue Mail certificate issue

[josede]

In Tools & Settings > SSL/TLS Certificates I have
Certificate for securing mail | Lets Encrypt certificate from server pool.
In each domain in Mail Settings I have
SSL/TLS certificate for mail | Lets Encrypt example.com
SSL/TLS certificate for mail | Lets Encrypt example1.com
SSL/TLS certificate for mail | Lets Encrypt example2.com
...

So, why when i add a new email in thunderbird or other platform, if i use the name server:
example.com or example1.com or example3.com (depending what email i am adding)
I get always error about the letsencrypt cert
(If i use the server name in this cert > Tools & Settings > SSL/TLS Certificates I dont get the error)


How can i fix this?