In fact, any character can be represented as a three character “=” sequence in quoted-printable. CR, LF, and CRLF are all used to indicate the end of a line of text in plain text emails. “=3D” is, in fact, an equal sign. =0D is a Carriage Return (CR), =0A is a Line Feed (LF), and =0D=0A is a CRLF combination.
When you see something like =3D, what you’re seeing is a single character of “quoted-printable” encoding. That’s correct - not all “plain text” is created equal. The problem is that there’s “plain text” email, and then there’s “plain text” email. You’d think that with plain-text email having been around for as long as it has, issues like this would have been resolved by now.
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