What are the IP address for mail server?

Dear Support Team,

in order to use our own smtp server our IT department need to know which ip address will try to access our system via port tcp/25.

Could you please provide us a list of the mail systems which are used for sending the mails?

Hello koesger,

You may like to take a look at the following guide for the list of IP address and domain names which you can whitelist:  https://www.jotform.com/help/145-Whitelisting-JotMails-IP-Addresses 

Thank you!