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@adison not sure what you are asking, are you asking to run email service on some other port? What should be built into cloudron? how would such a service work? if your IT won't let you open port 25, you cannot run an email service, there's nothing you can do.
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There are other threads on this topic on the forum already.
See this thread for more:
https://forum.cloudron.io/topic/6046/proxy-email-via-vps/