Mail hostname suddenly stopped working

[jonathanm]

rDNS/PTR = svr.miservidor.com

 

Querido Sandep, ¿cómo estás?

Tengo un problema y no entiendo la lógica.

Antes mis clientes se conectaban a través de Thunderbird con la siguiente configuración

Servidor entrante: mail.myclient.com
Usuario: usuario1@myclient.com
Puerto Imap: 993

Servidor saliente:  mail.myclient.com
Usuario:  usuario1@myclient.com
Puerto SMTP: 465

pero de un momento a otro dejo de funcionar
mail.myclient.com (dejo de funcionar)

ahora solo funciona con esta entrada y salida
svr.myserver (ahora solo funciona este)

 

Gracias

Edited January 4 by jonathanm

[Sandeep B.]

if you check the ssl for the hostname, is it returning the valid ssl ?

also send output for the command: 

openssl s_client -showcerts -connect mail.example.com:465

replace mail.example.com with your valid sub domain

[jonathanm]

certificate error

Message sending failed.
The other party's certificate has expired.
The configuration related to mail.myclient.com needs to be fixed.

[Sandeep B.]

1 minute ago, jonathanm said:

certificate error

Message sending failed.
The other party's certificate has expired.
The configuration related to mail.myclient.com needs to be fixed.

you can reinstall the ssl from cwp autossl module by deleting the current ssl and then recreating it, this will fix the mail ssl issue

[jonathanm]

I deleted the certificate and installed it again and the same message appears in thunderbird that does not deliver the certificate

add the following command in the terminal and if it gives me valid SSL
openssl s_client -showcerts -connect mail.example.com:465

[Sandeep B.]

Try to rebuild the mail server and test 

also send some screenshot of the error or send the subdomain name for the checks. 

[jonathanm]

now everything works fine

What I did, I changed the port to 587 and then went back to 465 and it worked.

thank you very much Sandeep B.