ABSTRACT:Check_RCPT ruleset should work properly by applying this testfix. It should return proper message to sendmail client while it could not have access to the sendmail server.(deniedIP). Steps for the sendmail configuration. =============================== 1.Create Localip file and put the ipaddress of clients which you want to realy from the sendmail server. 2.Modify the CHECK_RCPT rule set as follows- F{Localip} D:\mptn\etc\localip Scheck_rcpt R<$+@S* $=R> $@ ok R<$*@$=R> $@ ok R<$*@$*$=R> $@ ok R$*@$*$=R $@ ok R$+@$*$=R $@ ok R$* $: $& client_ifc R$={{LocalIp}} $@ ok R$*$={{LocalIp}}$* $@ ok R<$={{LocalIp}}> $@ ok # anything else is denied R$* $#error $:"550 relaying is denied" Files provided: =============== 11-22-01 3:14p 811 0 readme 11-22-01 2:29p 363036 61 sendmail.dll Step for installing the testfix. 1)copy the sendmail.dll in <>:tcpip/dll directory.