On Sat, Apr 18, 2009 at 08:27:43AM +0300, Andrei Popescu (andreimpope...@gmail.com) wrote:
> On Sat,18.Apr.09, 08:04:12, Kurian Thayil wrote: > > only whether the port is open or not. But what I need is to check if an > > SMTP server is listening in that port. So I guess the best tool is > > telnet and to check 220 status. > Hhm, I thought a port cannot be "open" unless some server is *listening* > on that port. What other server do you think would otherwise listen to > port 25? It could be under inetd, which would keep the port open even if it couldn't actually start the mail server, or there could be a mail server that's not accepting mail for some reason. And people do abuse ports - I've even seen ssh in port 25. So if the intent is to check if mail could be sent, checking for smtp reply code is better. (It's not 100% reliable either, but then nothing is, short of actually sending the mail and waiting for reply or something.) -- Tapani Tarvainen -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
