Plain text emails not working
Spamshield offers the possibility to send an email to a specified email address when it recognizes spam (email_notify). However starting with version 0.7.0 there's a syntax error (missing line break) in functions/class.tx_wtspamshield_mail.php in line 123:
$headers = 'From: ' . $from;
$headers .= 'Reply-To: ' . $from;
The resulting string is "From: <ex@mple>Reply-To: <ex@mple>" without a line break, and the email never gets sent.
I suggest to remove the "Reply-To" line altogether, because setting it to the same value as the From-address is redundant anyway.