OS X ending - character when viewing source
I assume this is in a section of the email marked with

--_000_7ACBD9F85F865846BB187E5B1529E52F25B26392F5LBCPLCYVMB002_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable


Where the first line would be a different long series of digits.

In this case = just marks a line continuation, To get the text delete it and the following CR and LF characters.

The encoding is needed as email as per RFC5322 says


  Lines of characters in the body MUST be limited to 998 characters,
        and SHOULD be limited to 78 characters, excluding the CRLF.


The encoding is quoted-printable and that is defined in RFC2045


  (Soft Line Breaks) The Quoted-Printable encoding
            REQUIRES that encoded lines be no more than 76
            characters long.  If longer lines are to be encoded
            with the Quoted-Printable encoding, "soft" line breaks
            must be used.  An equal sign as the last character on a
            encoded line indicates such a non-significant ("soft")
            line break in the encoded text.


The workaround is use a script to decode the MIME encapsulation