I can send email to my local domain but not outside my domain

I am using CentOS Linux release 7.4.1708 (Core) forwarded all the required ports needed for Sentora to function correctly on my router Installed Sentora Control panel setup domains and sub domains created 2 mailbox mail can be sent and received from those 2 email ID’s but cannot send email from those ID’s to other domain emails like gmail and hotmails i went through lots of blogs and videos. serverfault, stackoverflow, etc trying from last 2 weeks but still stucked please show me some way so that i can figure out

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Have you tried sending an email to the mail tester site:

It will generate a report for you and you will be able to tell what might be stopping your emails from reaching the recipients.