Katalon unable to sent reports to desired email address

Despite correctly configured email server I am unable to send reports to desired emails (unable to send test email). Help, please!

Have you followed user guide here?
https://docs.katalon.com/display/KD/How+to+configure+email+settings+in+Email+Preferences

Yes, it used to work, but after latest Katalon update it stopped working…

It’s working ok for me. I am on version:

Katalon Studio
Version: 5.2.0
Build: 1

mail setup.png

Solved! Anti virus has to be disabled!