GetDomainSpamGreylist()
From Rackspace Email & Apps API
This function will check greylisting status for a domain. Greylisting forces new sender/server combinations to resend their messages a 2nd time in accordance with SMTP RFC specifications and has the effect of reducing spam.
Parameters
Three strings, one result integer:
Administrative username, Administrative password, Domain name,
Enabled/disabled (1 = enabled, 0 = disabled)
Return Values
If successful, the return value of the function will be 1.
Consult the Result Code Table for a list of result codes and their meaning.