Are you trying in PDI? then check this:
https://www.servicenow.com/community/developer-forum/solution-how-to-configure-email-account-in-serv...
Generally, port 443 for incoming SSH access, and port 23 for incoming SMTP.
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Regards
Dr Atul G. - Learn N Grow Together ServiceNow Techno - Functional Trainer
LinkedIn: https://www.linkedin.com/in/dratulgrover
YouTube: https://www.youtube.com/@LearnNGrowTogetherwithAtulG
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