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The file from within the plugin that you need is: /post-by-email/library/sp-email-post-imap.php

The function you need is: sp_process_inbox_imap()

Trawl down the code until you find this line of code:

if(empty($content) && $maybeNew) $content = $rawContent;

and then place the following line of code immediately after it:

$content = trim(utf8_encode(quoted_printable_decode($content)));

and let's see if that helps with your issue.