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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.eng.convex.com!newshost.convex.com!newsgate.duke.edu!news.mathworks.com!newsfeed.internetmci.com!uuneo.neosoft.com!insync!uunet!inXS.uu.net!demos!news.rssi.ru!news.ioffe.rssi.ru!fl.ioffe.rssi.ru!hill From: hill@fl.ioffe.rssi.ru (Andrey Y. Khilko) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Mail......What does this mean?? Date: 13 Jul 1996 14:40:25 GMT Organization: A.F.Ioffe Physico-Technical Institute. Russian Academy of Sciences. Lines: 16 Message-ID: <4s8cgp$hjr@ccioffe.ioffe.rssi.ru> References: <31e6811d.21963902@news.hq.af.mil> NNTP-Posting-Host: fl.ioffe.rssi.ru X-Newsreader: TIN [version 1.2 PL2] Scott Gregory (sgregory@pubspo.hq.af.mil) wrote: : Jul 12 10:38:43 my.sys.name sendmail[17654]: foo.bar : [123.123.123.123]: vrfy lhammer : What does this mean?? I know date, time, sys name, log entry, That is address verification. If user lhammer exsists sendmail returns something like `Real Name <lhammer@my.sys.name>`. Otherwise it returns `user unknown`. : Is this a security concern?? I'm STILL new at this so please explain It is up to you to decide. SY, Andrey Khilko