SmtpDomainValidationFlags Metabase Property (IIS 6.0)
Setting the SmtpDomainValidationFlags property key to a nonzero value causes the domain passed to the EHLO command to be checked to determine if it is well formatted.
The metabase represents unlimited as the DWORD value of 4294967295 (0xFFFFFFFF); however, VBScript represents unlimited in hexadecimal format as &HFFFFFFFF. Previous versions of IIS represented unlimited as -1.
You can configure this property at the following locations in the IIS metabase.
For general code examples, see Code Examples to Configure Metabase Properties.