How do I stop Gmail from stripping the values out of URLs?

Question

I recently learned that webmail clients like Gmail will do alterations on HTML emails, for example adding target=\"_blank\" to tags.

Answer 1

Emailing in html uses Quoted-printable Encoding. The problem with your $mailContent is that the "=" must be represented by =3D

Try adding this: $mailContent = quoted_printable_encode($mailContent);