ON Exchange 2010/13/19 when you try to give Send As Permissions for security group to users Group you may get this error : Access is denied. Active directory response: 00000005: SecErr: DSID-03152857, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0 To work around this issue, add the “modify permissions” permission for the Exchange Trusted Subsystem group to theContinue reading “Send-As problem 4003 (INSUFF_ACCESS_RIGHTS), data 0”