SMTP host – settings problem

Hi,
we have a problem with the smtp settings.
We use an external smtp service with host “ssl://pro.turbo-smtp.com: 465”.
It works well and we have no problems with this configuration.
Now the external smtp service has changed the Host address to “pro.eu.turbo-smtp.com”, therefore we have updated the options in “ssl://pro.eu.turbo-smtp.com: 465”.
We saved the settings and sent the test email.
At this point the site has stopped working and no longer responds until we return to the previous settings (we are forced to change it on mysql in the wp-option table because the site is blocked).
We do not have the same problem with other plugins using the new smtp configuration.
thanks for support.

Stefania