A zero-width non-joiner is a “non printing” character, which means that it does not represent a written symbol.
For example, place a zero-width non-joiner (ZWNJ) after the first character in a string of blue linked text:
A‌lpha Farnborough, Hampshire, GU14 6BU, United Kingdom
The ZWNJ is placed right after the first letter in the address. This will work on iOS devices, but for any recipient that displays your email inAndroid 2.3 or above, the address will look slightly odd.