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For those using Join, Pushbullet, or similar apps to send and receive SMS/MMS from web or desktop, putting your SMS in Signal somehow breaks this functionally. The dev is aware but plans to remedy the situation have not been named a priority. See More
I am assuming that meeting the person face-to-face isn't an option. What I like about Keybase for this use case is that users can "prove" their identity using social media. This creates a web of trust so that you know that the person you are corresponding with is the person they claim to be. It's built on top of PGP/GPG so you can still use email as the transport mechanism if necessary. Keybase also offers other collaboration features like file sharing and group chat. See More
Ben Mendis's Experience
It's simpler and more secure than most other products. See More