Currently moving a website from PHP 5.2 to PHP 5.6 web server.
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Headers received in hotmail:
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Return-Path: *********
X-OriginalArrivalTime: 26 Nov 2015 12:41:08.0908 (UTC) FILETIME=[B96B96C0:01D12847]
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Line "iVBORw0KGgoAAAANSUhEUgAAABQAAAAiCAMAAABodAmPAAAByFBMVEUAAACdPTedPTehQDqiQDqh" is missing and can't figure out why. If the attachment has only 1 base64 line, then that gets deleted and file will be received as blank.
Before moving to new server, code had newline between file headers and base64 content, but PHP 5.6 new security update requires that header cannot contain any blank lines (Error with PHP mail(): Multiple or malformed newlines found in additional_header)
