repo_zf1/documentation/manual/en/module_specs/Zend_Mail-Encoding.xml

<?xml version="1.0" encoding="UTF-8"?>
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<sect1 id="zend.mail.encoding">
    <title>Encoding</title>
    <para>
        Text and HTML message bodies are encoded with the quotedprintable mechanism by default. Message headers
        are also encoded with the quotedprintable mechanism if you do not specify base64 in <code>setHeaderEncoding()</code>.
        All other attachments are encoded via base64 if no other encoding is given in the <code>addAttachment()</code>
        call or assigned to the MIME part object later. 7Bit and 8Bit encoding currently only pass on the
        binary content data.
    </para>
    <para>
        <classname>Zend_Mail_Transport_Smtp</classname> encodes lines starting with one dot or two dots so that the mail
        does not violate the SMTP protocol.
    </para>
</sect1>
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