I can not send mail through port 25

Some ISPs block the sending of mail through the SMTP port 25 because of problems with the epidemic of the virus. In this regard, all our hosting servers have several alternate SMTP ports.

Directadmin hosting:

SMTP port without SSL: 25, 587

SMTP port wint SSL support: 465

cPanel hosting:

SMTP port without SSL: 25, 26

SMTP port with SSL support: 465