I have configured on my ISA server a Server publishing rule for SMTP on port 25, this has been working without any issues for 18 months, until recently about the last 4 weeks, the ISA server will stop accepting SMTP mail. The only way for me to fix this is to stop and start all ISA services. Nothing has changed on the ISA server. Anyone have any ideas for my issue? Thanks Mark My server is Windows 2000 SP3 ISA Server FP1