Removing hidden characters from within strings

Question

My problem:

I have a .NET application that sends out newsletters via email. When the newsletters are viewed in outlook, outlook displays a question mark in place

Answer 1

It has been a while but this haven't been answered yet.

How do you include the HMTL content in the sending code? if you are reading it from file, check the file encoding. If you are using UTF-8 with signature (the name slightly varies between editors), this is may cause the weird char at the begining of the mail.