<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<TITLE>Re: Massive queue buildup</TITLE>
<META content="MSHTML 6.00.2900.2975" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=994223210-14112006>"</SPAN>One important thing to watch for is
that for larger sites the server that<BR>first tries to send your email might
not be the one that tries to resend<BR>it later. Greylisting sites will thus
block the email for a while until<BR>the sending site gets lucky and uses the
same machine twice in a row.<BR><BR>Generating tempfail messages to sending
sites is just asking for<BR>trouble IMHO. You really can't determine exactly
they will act and how<BR>long they will take to retry to send the message. Any
delay is 100%<BR>your fault although most people using greylisting seem keen to
push the<BR>blame to the sending site.<BR><BR>It's the equivalent of ignoring
someone when they first email/call you and<BR>saying "If it's important they'll
ring back" . Not very polite and<BR>possibly not providing the best service to
customers.<SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2>"</FONT></SPAN></DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff size=2>That's
precisely why milter-greylist has a whitelist of non-conformant hosts /
subnets.</FONT></SPAN></DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2>FUD.</FONT></SPAN></DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2>Cheers,</FONT></SPAN></DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994223210-14112006><FONT face=Arial color=#0000ff
size=2>Phil</FONT></SPAN></DIV>
<DIV><SPAN class=994223210-14112006>
<DIV dir=ltr align=left><FONT size=2></FONT> </DIV>
<DIV dir=ltr align=left><FONT size=2>--<BR>Phil Randal<BR>Network
Engineer<BR>Herefordshire Council<BR>Hereford,
UK </FONT> </SPAN></DIV></DIV></BODY></HTML>