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fuser 25/tcp (see which pid is listening on smtp)
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lsof -i tcp:25gives a little more info; *both* fuser and lsof need root privileges to report processes other than the ones they run as, though (whereas
netstat -apwill at least show you the port is open, though it won't find the pid without privileges...
For some reason fuser doesn't work sometimes, but lsof does. I will look into that later.