I am having a devil of a problem getting my Exchange Server to get the mails from my ISP. I have had to create an SMTP connector and in there I have set the ISP's SmartHost IP address and also the ETRN for my site. I have set it so that the ETRN is issued whenever a mail is sent out and also for a Custom Interval (15 mins). Whenever I send out a mail from one of the Outlook clients then the ETRN is obviously issued as mail comes down right away. If I send mail to myself from outside (say, from my Hotmail account) and then leave the room for an hour or more then the ETRN is obviously not being sent even though the ISDN is still up and running. The Exchange 2000 server is in mixed mode on a mixed mode Windows 2000 machine. Sharing this machine is my ISDN card and the ISA server. This is the only snag which is affecting me as mail seems to be coming in and out alright (only if I send out a mail though). Other than to write a small VB app which sends out a mail message to my hotmail account every fifteen minutes is there anything else which I could do?