Indeed. Perhaps look into cache settings for redundant lookups. -- ME2
On Thu, Jan 20, 2011 at 8:07 AM, Paul Hutchings <paul.hutchi...@mira.co.uk>wrote: > Maybe it queries more RBLs, maybe it does root hint lookups rather than > forwarders, it could be a lot of things depending on how it's configured > vs. the old product. > > Paul > > -----Original Message----- > From: Osborne, Richard [mailto:richard.osbo...@wth.org] > Sent: 20 January 2011 16:03 > To: MS-Exchange Admin Issues > Subject: anti-spam DNS requests > > Our anti-spam solution sits behind our firewall with the necessary ports > open to the Internet. We recently changed from a Windows-based > (Symantec Mail Security) to a Linux-based (SpamTitan) anti-spam system. > My firewall guy is concerned that the number of DNS connections on the > firewall (Checkpoint Firewall-1) has more than doubled. We saw the same > behavior when we demo'ed Untangle (also Linux-based). > > Both anti-spam solutions use RBL's, so of course there will be a lot of > DNS requests. > > Any ideas why the number has grown so much higher and whether it should > be a concern? Should we just move our anti-spam server outside the > firewall? > > Thanks. > > > Richard Osborne > Information Systems > Jackson-Madison County General Hospital > > NOTICE: (1) The foregoing is not intended to be a legally binding or > legally effective electronic signature. (2) This message may contain > legally privileged or confidential information. If you are not the > intended recipient of this message, please so notify me, disregard the > foregoing message, and delete the message immediately. I apologize for > any inconvenience this may have caused. > > > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist > > > -- > MIRA Ltd > > Watling Street, Nuneaton, Warwickshire, CV10 0TU, England > Registered in England and Wales No. 402570 > VAT Registration GB 100 1464 84 > > The contents of this e-mail are confidential and are solely for the use of > the intended recipient. If you receive this e-mail in error, please delete > it and notify us either by e-mail, telephone or fax. You should not copy, > forward or otherwise disclose the content of the e-mail as this is > prohibited. > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist > > --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
