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  14    <H1>[IRCServices] Email forwarding</H1>
  15     <B>Jonathan Morton</B>
  16     <A HREF="mailto:ircservices%40ircservices.za.net?Subject=%5BIRCServices%5D%20Email%20forwarding&In-Reply-To=3a6be17f.20022%40prima-lan.net"
  17        TITLE="[IRCServices] Email forwarding">chromi at cyberspace.org
  18        </A><BR>
  19     <I>Mon Jan 22 03:04:22 PST 2001</I>
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  34 <PRE>&gt;&gt;<i>What part of this is open to resource attacks?
  35 </I>&gt;<i>
  36 </I>&gt;<i>/ns set email <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">some-domain at that.doesnt.resolve</A>
  37 </I>&gt;<i>/ns sendpass
  38 </I>&gt;<i>
  39 </I>&gt;<i>Lather, rinse, repeat and watch sendmail choke.
  40 </I>
  41 Depends heavily on your choice of MTA.  Sendmail may behave like this but
  42 Exim [<A HREF="http://www.exim.org/]">http://www.exim.org/]</A> sure doesn't...  however putting limits on is
  43 still a good idea due to the extra resources consumed by having N number of
  44 Exim processes waiting for their domain resolvers.  However, you still need
  45 some method of dealing with bounce messages - /dev/null sounds just perfect
  46 here.
  47
  48 Domain resolving can be partially mitigated by running one's own
  49 caching-only DNS server, which is listening only on the localhost interface
  50 and not to anything externally visible.  However I have to agree that
  51 running DNS lookups for every user would be far too much for a single
  52 process to handle.  The IRCd already does this, so IP information should be
  53 given out as and when available rather than Services having to figure it
  54 all out for itself.
  55
  56 (In case you were wondering, I rather like Exim - readable config files,
  57 completely bulletproof, and regularly maintained.  I use it, my university
  58 uses it - come to that, most UK universities use it - and I've not had any
  59 trouble with it.  I can't say the same for those people I know to be using
  60 Sendmail.)
  61
  62 --------------------------------------------------------------
  63 from:     Jonathan &quot;Chromatix&quot; Morton
  64 mail:     <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">chromi at cyberspace.org</A>  (not for attachments)
  65 big-mail: <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">chromatix at penguinpowered.com</A>
  66 uni-mail: <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">j.d.morton at lancaster.ac.uk</A>
  67
  68 The key to knowledge is not to rely on people to teach you it.
  69
  70 Get VNC Server for Macintosh from <A HREF="http://www.chromatix.uklinux.net/vnc/">http://www.chromatix.uklinux.net/vnc/</A>
  71
  72 -----BEGIN GEEK CODE BLOCK-----
  73 Version 3.12
  74 GCS$/E/S dpu(!) s:- a20 C+++ UL++ P L+++ E W+ N- o? K? w--- O-- M++$ V? PS
  75 PE- Y+ PGP++ t- 5- X- R !tv b++ DI+++ D G e+ h+ r- y+
  76 -----END GEEK CODE BLOCK-----
  77
  78
  79
  80
  81 </PRE>
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