This is such a major flaw that I've reported it as a bug, but thought it would be nice to see if anyone else agrees this is a flaw (please upvote if you do):
The links generated for emails to tasks contain the "+" symbol. Some email service providers such as gmail accept the + symbol, ignore it, and allow you to use it as a method to tag incoming emails. However, most providers such as Microsoft treat it as an invalid character. This is a MAJOR issue and destroys the functionality of using email links to Wrike tasks for anyone not using "gmail" to conduct business! For example, to add Wrike as a guest user in Microsoft Azure, email address must NOT contain the “+” symbol.