Mautic - Email setting - Testing error

Your software
My Mautic version is: 4
My PHP version is: 7.4

Your problem
My problem is: Error while testing connection

Error:
Unable to connect with TLS encryption Log data: ++ Starting Swift_SmtpTransport << 220 hrinfo360.com ESMTP Postfix >> EHLO hrinfo360.com << 250-hrinfo360.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 hrinfo360.com ESMTP Postfix >> EHLO hrinfo360.com << 250-hrinfo360.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)

Steps I have tried to fix the problem: Tried over youtube videos to find a negative resp.