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<FONT size=2 face=Tahoma><B>From:</B> mailscanner-bounces@lists.mailscanner.info
[mailto:mailscanner-bounces@lists.mailscanner.info] <B>On Behalf Of </B>Jerry
Benton<BR><B>Sent:</B> Wednesday, April 17, 2013 1:22 AM<BR><B>To:</B>
MailScanner discussion<BR><B>Subject:</B> Re: Bouncing messages with missing
From: info<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr>Null sender is RFC standard for NDRs.<BR><SPAN
class=547433212-17042013><FONT color=#0000ff size=2 face=Arial>[Rick
Cooper] </FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=547433212-17042013></SPAN> </DIV>
<DIV dir=ltr><SPAN class=547433212-17042013><FONT color=#0000ff size=2
face=Arial>Exactly hence the admonishment not to reject based on null
sender. However I once got a huge mess of bounce spam directed at three
specific, valid, users and set a rule that rejected emails to those users
with a null sender until it seemed to cease (which took about a month). The
thing that really pissed me off is we publish SPF with a hard fail so there was
really not valid reason that either end should have had to deal with it,
except the bouncing systems were to lazy to implement SPF checks on their
end. IMHO even if you do not implement SPF on your end you should at least check
SPF for inbound mails</FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=547433212-17042013></SPAN> </DIV>
<DIV dir=ltr><SPAN class=547433212-17042013><FONT color=#0000ff size=2
face=Arial>Rick</FONT> </SPAN></DIV>
<DIV class=gmail_extra><BR><BR>
<DIV class=gmail_quote>On Wed, Apr 17, 2013 at 3:11 AM, Rick Cooper <SPAN
dir=ltr><<A href="mailto:rcooper@dwford.com"
target=_blank>rcooper@dwford.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV class=im>Raymond Norton wrote:<BR>> I am using MailScanner 4.84.5 with
postfix. I have one relay domain<BR>> getting hit hard by non
delivery notices which are missing any info<BR>> in the "From"
field.<BR>><BR>> Is there a rule I can add to postfix that will bounce
messages like<BR>> this?<BR>><BR>><BR>> Raymond<BR><BR></DIV>You
should not bounce or reject anything based on null senders as that<BR>prevents
legitimate bounces.<BR>You do not state if the TO addresses are valid, if they
are you will have to<BR>deal with it unless you see a pattern of valid users
that are getting the<BR>bounces, in which case (I have had to do this in the
past) we deny or<BR>redirect bounces to that/those users that also have a null
sender. If they<BR>are invalid then you should be rejecting them at RCPT
time.<BR><BR>My philosophy is I NEVER bounce anything. Once accepted it's my
problem and<BR>I do not accept non deliverable emails, or emails that are
supposedly coming<BR>from my domain but not one of my servers or any Hard fail
SPF result or<BR>failed DKIM, or other criteria. Once I take it it's my
problem so I just<BR>don't take problems<BR><SPAN class=HOEnZb><FONT
color=#888888><BR>Rick<BR></FONT></SPAN>
<DIV class=HOEnZb>
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<DIV><BR></DIV>-- <BR>
<DIV dir=ltr>
<DIV>
<DIV><BR>--<BR></DIV>Jerry Benton<BR></DIV>Mailborder Systems<BR><A
href="http://www.mailborder.com"
target=_blank>www.mailborder.com</A><BR></DIV></DIV></BODY></HTML>