Attack against postfix allows sending of spoofed mail
FYI: Postfix has currently an unpatched vulnerability which allows sending of spoofed mail: www.postfix.org/smtp-smuggling.html
A fix is currently not available but to have peaceful holidays one should have these lines in the configuration as a workaround:
<span style="color:#323232;">main.cf:
</span><span style="color:#323232;"> smtpd_data_restrictions = reject_unauth_pipelining
</span><span style="color:#323232;"> smtpd_discard_ehlo_keywords = chunking
</span>