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I’m trying to duplicate a mailer I got into my gmail by taking a look at its code. I see a lot of this in multiple source viewers:
<td style=3D"border-bottom: 1px dotted rgb(153,157, 147); border-top: 1px solid rgb(28, 140, 78);" width=3D"90">=A0</td>
<td style=3D"border-bottom: 1px dotted rgb(153,157, 147); border-top: 1px solid rgb(28, 140, 78);" align=3D"right" width=3D"110">
Is 3D some sort of mail rendering thing I don’t know about?
It’s an email encoding system called “quoted-printable“, which allows non-ASCII characters to be represented as ASCII for email transportation.
In quoted-printable, any non-standard email octets are represented as an
=sign followed by two hex digits representing the octet’s value. Of course, to represent a plain=in email, it needs to be represented using quoted-printable encoding too: 3D are the hex digits corresponding to=‘s ASCII value (61).