Check your SMTP filter settings for command lengths... NOOP has been problematic before at its default of 6 I changed mine to 20 after sniffing traffic and determining some older Exchange boxes were padding NOOP with spaces.. t On 1/18/07 1:46 PM, "ISA" <ISA@xxxxxxxxxxxxxxxx> spoketh to all: > Hope someone can help! > > I think this is an ISA 2004 (patched) issue. > > From some clients I can send/receive email just fine (and telnet port 25). But > from other clients I can not. I monitored the ISA logs and observed the > connection initiated then being closed. > > From Exchange 2003 box I shut of IMF and GFI services still not luck > receiving email or telnet¹ing from a particular client. > > Any ideas would be greatly appreciated. > > Respectfully > > > Joseph Danielsen, MCSA-Messaging, MCP > Network Blade Inc. > 49 Marcy Street > Somerset, NJ 0887 > 732-213-0600 >