I hope anyone can help me with this problem. I don't know what am I missing here..

I have problems sending emails with my application (contact form), although everything works perfectly with sending and receiving emails from within my account with your application mail.zoho.com.

1. I get connection timed out error and some exceptions using php package Swiftmailer. On my server I have enabled errors, so I can attach some screenshots.

Error below is probably the cause of timed out connection, so it's probably not telling much.

2. In my firewall configuration I allowed all necessary outgoing TCP ports. Tested two ports showing on screenshot below. But I'm not sure if this is the only place i should make changes to in firewall conf...

3. And settings in my env file....

 

What am I missing here? 

I'll be glad of any help. Thanks.