There is a zero-width non-breaking space that I like to use:
I place it in strategic places so that the URL does not get recognized as a URL, like so:
http﻿://www﻿domain.﻿com.This strategy has worked for me across platforms and rendering clients. Its advantages are twofold:
1) It prevents the client from auto-rendering text as a link, and
2) Unlike other "non-breaking" zero-width space ascii codes (ie ⁮), it wraps the entire URL if your URL happens to need it (instead of just the parts after the zero-width space).
It served my purpose of not allowing email clients to automatically make it a hyperlink.