I am having a REAL problem with this STARTTLS issue. I want to enable the SMTP Filter but every time I do there are certain e-mail servers that don't seem to get through. Specifically email servers that require TLS secured channel communication. It is clear from the headers and logs that the issue is directly a cause of this feature not working on the ISA Server, SMTP Filter. The STARTTLS Command is listed on my ISA Server with a LENGTH of 268. With the recent Virus outbreaks on the internet the function of using the SMTP filter is a critical asset but not at the expense of loosing legitimate emails. Since we can't control the configuuration of other's email servers it would appear that this needs to be fixed ASAP. Has anyone found a work around for this yet? Thanks for any help. Troy Grover Network Operations Specialist MCSE+I