Some sendmail milters due look at that banner. And perform lookups on it. One which comes to mind is milter-spiff (SPF checks). A misconfiguration host with misleading banner information may also contain other misconfiguration which, while may not allow spam, may cause some MTAs to reject the message.
--- Benji Spencer System Administrator Ph: 312-329-2288 > -----Original Message----- > From: Jonas Eckerman [mailto:[EMAIL PROTECTED] > Sent: Friday, November 30, 2007 5:45 AM > To: users@spamassassin.apache.org > Subject: Re: Forward Conformed Reverse DNS troubleshooting tool > > Vivek Khera wrote: > > > On Nov 29, 2007, at 10:19 AM, Mike Jackson wrote: > > > >> It also confirms that your SMTP banner greeting matches the reverse > DNS. > > > > Who requires this? > > The hostname in the banner is usually the same hostname as in > HELO/EHLO, and it's often a good idea to HELO/EHLO with a > hostname that matches RDNS. > > (I don't know if that's the reason for the check, but it does > make sense if it is.) > > Regards > /Jonas > > -- > Jonas Eckerman, FSDB & Fruktträdet > http://whatever.frukt.org/ > http://www.fsdb.org/ > http://www.frukt.org/
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