MailWizz. Unable to verify delivery server. What's wrong?

Question

linux

Good day.
Installed MailWizz on a virtual server

cloud.digitalocean.com

The installation was successful. Cron registered. I started adding the smtp server of my domain, the following error occurs when confirming:

For the test, I tried to add the smtp server of free mail (mail.ru) - everything was perfectly confirmed.
On the mailwizz forum, I was sent here:

https://forum.mailwizz.com/threads/unable-to-conne...

I did not understand anything. If anyone has the opportunity to suggest a solution to the problem, based on this topic - I will be very grateful.

Answer 1

Have you tried to do as recommended in the answer on your link?
stackoverflow.com/questions/26896265/php-swiftmail...
Specifically - add

->setStreamOptions(array('ssl' => array('allow_self_signed' => true, 'verify_peer' => false)));