Mautic Config - Email Setting - Testing Error

While configuring Mautic - Email Settings
Can someone please help me out with the following error occurred:

Unable to connect with TLS encryption Log data: ++ Starting Swift_SmtpTransport << 220 hrinfo360.com ESMTP Postfix >> EHLO hrinfo360.com

can you please check this guide-> How To Install And Setup Mautic On CyberPanel

@usmannasir - the guide is not helpful. facing similar issues - any help will be appreciated. See my error below - Is there a way to re-install mautic on cyberpanel and update it without losing my data on mariaDB on my server

Unable to connect with TLS encryption Log data: ++ Starting Swift_SmtpTransport << 220 mail_domain_com ESMTP Postfix >> EHLO mautic_domain_com << 250-mail_domain_com 250-PIPELINING 250-SIZE 30720000 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250 CHUNKING >> STARTTLS << 220 2.0.0 Ready to start TLS !! Unable to connect with TLS encryption (code: 0)
++ Starting Swift_SmtpTransport << 220 mail_domain_com ESMTP Postfix >> EHLO mautic_tx*****_com << 250-mail_tx*****_com 250-PIPELINING 250-SIZE 30720000 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250 CHUNKING >> STARTTLS << 220 2.0.0 Ready to start TLS !! Unable to connect with TLS encryption (code: 0)

@shoaibkk any help will be appreciated