Updated the script. It now replaces =3D in a URL with =
Background:
The HTML is encoded with what is called quoted-printable . Basically an = at the end of a line indicates a line wrap, so
he=
lloshould be read as “hello” and not as “he llo”
because the = has this special meaning some other character (sequence) is needed to put = characters in the text literally, and that is =3D
https://www.sitepoint.com/community/t/what-does-3d-mean-in-this-html-email/7033