#500 Firewall Error in email failure

Unanswered Question
May 22nd, 2009
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This error seems to occur when an email has multiple recipients.  Based on some research, there seems to be a corrleation between this error and multiple recipients in the same domain.

The posts which I found searching the web indicate that

ip inspect SDM_LOW out

might be related to this problem.

Does anyone know what I can replace this statement with, so that the UC520 will still work, but without this error?

I tried removing the line entirely, but that broke DNS.

This is the show on dialer0

Dialer0 is up, line protocol is up
  Internet address is ... (removed for security)
  Broadcast address is
  Address determined by IPCP
  MTU is 1452 bytes
  Helper address is not set
  Directed broadcast forwarding is disabled
  Outgoing access list is not set
  Inbound  access list is 104
  Proxy ARP is enabled
  Local Proxy ARP is disabled
  Security level is default
  Split horizon is enabled
  ICMP redirects are always sent
  ICMP unreachables are always sent
  ICMP mask replies are never sent
  IP fast switching is enabled
  IP fast switching on the same interface is enabled
  IP Flow switching is disabled
  IP CEF switching is enabled
  IP CEF switching turbo vector
  IP Null turbo vector
  IP multicast fast switching is enabled
  IP multicast distributed fast switching is disabled
  IP route-cache flags are Fast, CEF
  Router Discovery is disabled
  IP output packet accounting is disabled
  IP access violation accounting is disabled
  TCP/IP header compression is disabled
  RTP/IP header compression is disabled
  Policy routing is disabled
  Network address translation is enabled, interface in domain outside
  BGP Policy Mapping is disabled
  Input features: Stateful Inspection, Dialer i/f override, Virtual Fragment Reassembly, Access List, IPSec input classification, Virtual Fragment Reassembly After IPSec Decryption, NAT Outside, MCI Check
  Output features: CCE Output Classification, Post-routing NAT Outside, Stateful Inspection, IPSec output classification, Firewall (NAT), Firewall (inspect), IPSec: to crypto engine, Post-encryption output features, Dialer idle reset, Dialer idle reset
  Outgoing inspection rule is SDM_LOW

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