[INTERLINKED-12] Production mail server migration
Implement the Simple Network Paging Protocol (https://www.rfc-editor.org/in-notes/rfc1861.txt)
Support would be limited to providing an SNPP interface for clients and then, likely, either forwarding pages to a pager gateway email address or dialing up the pager number and sending a numeric page (the latter of which really is rather out of scope for a BBS). So to be generic, the available actions should be to forward to an email gateway address (depending on the user) or execute some kind of external program with the received input, where the sysop can do something custom. Since sysops are unlikely to control their own paging equipment, providing tighter integration than that is more difficult.
Additionally, Spok does not (perhaps no longer) support SNPP, so even proxying to another SNPP server may not make sense these days. However, this module can be used to provide an SNPP interface for page forwarding to providers that don't support it anymore, while also providing an additional layer of security by not exposing a user's real pager address.
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