Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Email works fine with non-static IP addresses. I suspect VoIP does too.
No it does not. You need an active PTR record for email to work for most of the major carriers (Gmail, O365, etc...). Many providers will just outright block consumer IP ranges as well.
You cannot host an email server on dynamic addresses.
Edit: And you've edited in the VoIP part of your comment... Same thing there, you need PTR and such for those services to work well... Which generally can't be assigned to dynamic addresses.
I never had an issue doing VoIP on a dynamic IP.
Then you have a SIP trunk provider that doesn't validate domain ownership... I'd like to know that companies name if you don't mind sharing. They're stupidly rare to the point that I view it as a unicorn situation.
Edit: To clarify, I've tried finding such providers and failed for several years... They all want PTR validation for "security"