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Basic DNS: PTR records and why you care A PTR record is what lets someone do a "reverse" DNS lookup - that is, they have your IP address and want to know what your host/domain is. At any Unix/Linux command line, you can use "dig -x" to do a reverse lookup:
SpamCheetah Realizing the potential of a technology is key to success. You also have to be quick at realizing the potential of humans...then only you can employ good people and grow. The insight you get in learning various technologies will help you in a big way
Help - I'm on a blacklist You are getting bounced mail that says your email can't be delivered because you are on a blacklist. Almost always there will be instructions or a link in the bounce message that tells you what you need to do next. It's usually pretty simple. You follow the directions and get yourself removed, but a month or so later it happens again. You are unhappy, and if you are one of my Kerio Mailservercustomers, you might have sent me an email saying just how unhappy you are.


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Title Date Comments
An Interesting Kerio Problem   2009 10  2009/10/12 18:21 TonyLawrence

How relevant is a good antispam solution for you?   2009 08 

Troubleshooting failed email   2009 08  2009/08/21 20:43 TonyLawrence

SpamCheetah   2009 08 

Kerio Mailserver Maintenance   2009 07 

Help - I'm on a blacklist   2009 06 

Kerio Mailserver 6.7   2009 05 

Kerio Mailserver vs. Microsoft Exchange   2009 03  2009/07/22 18:02 TonyLawrence

Kerio Webmail   2009 03 

Sneakers on a Dead Pig   2009 02  2009/02/26 15:24 BigDumbDInosaur

Using Free Google Gmail with your Domain   2009 01  2009/01/29 15:26 NickBarron

Resource Scheduling in Kerio   2008 11 

 
 
 
 
Sharing Kerio Folders, Calendars and Contacts   2008 11  2009/03/05 13:31 TonyLawrence

What is basic, anyway?   2008 09  2008/09/18 19:42 skylab72

Email Basics   2008 08 

Kerio Mail Transfer   2008 07 

Changing Primary Domain in Kerio Mailserver   2008 06 

Fixing Large Kerio Mailboxes   2008 05  2009/10/13 00:10 NickBarron

Kerio Troubleshooting   2008 05 

Kerio Configuration   2008 05 

Kerio 6.5 review   2008 04  2008/11/27 23:54 TonyLawrence

Twelve or more things I still want in Gmail   2008 01  2009/11/01 01:42 TonyLawrence

Kerio Pricing   2007 12 

Maccy Xmas and hope you have some time off   2007 12 

Leopard's Spotlight   2007 11  2008/01/21 16:20 anonymous

Gmail vs. in-house Mail Server   2007 10  2009/01/28 13:58 TonyLawrence

Kerio Virtual Appliance   2007 08 

Using Sieve for spam in Kerio Mailserver   2006 12 

Some common email problems   2006 12  2006/12/09 05:58 BigDumbDinosaur

Automatically cleaning Kerio Mail Folders   2006 11  2008/06/18 23:49 TonyLawrence

Kerio Preferred Partner   2006 10 

Kerio MailServer ActiveSync   2006 09  2008/04/09 22:40 TonyLawrence

Kerio Mail Server with Spamassassin   2006 07  2009/03/19 14:22 TonyLawrence

Kerio Mail Server Spam Filtering   2006 07  2008/09/30 17:18 anonymous

Fake blacklists?   2006 07  2006/07/13 19:23 TonyLawrence

Kerio Mailserver Blacklists   2006 07  2006/07/05 19:00 TonyLawrence

Who is Louella Slaton?   2006 06  2007/09/25 15:25 BigDumbDinosaur

ClamAV on Mac   2006 06 

Converting Sendmail to Kerio   2006 04 

Apache Spammers   2006 03 

Charging for email   2006 03 

Web Hosting Niche - Email Hosting   2006 02  2006/04/20 23:09 anonymous

Gmail for your domain   2006 02 

Why you need a true secondary DNS server   2006 02 

All I want for Xmas is for Google to..Gmail   2006 02 

Understanding MX records   2005 12 

C++ or C (or both?)   2005 10  2005/10/31 20:23 Dean

A Dead Mailserver   2005 08 

Archiving All Email   2005 07  2005/07/30 14:27 BigDumbDinosaur

Jim Mohr's SCO Companion   2005 07 

 
 
 
 
Ending Spam:Bayesian Content Filtering and the Art of Statistical Language Classification   2005 07 

Domain keys   2005 06 

X-face image generation   2005 06  2005/06/28 20:59 taylor

Secondary MX: Tech Words the Day   2005 04 

Fairuce: Tech Words the Day   2005 03 

Thunderbird: Tech Words the Day   2005 03  2005/03/27 16:45 TonyLawrence

GETTING A MAC TO PHONE HOME WITH AN E-MAIL - NO SENDMAIL, NO POSTFIX   2005 02  2005/03/09 15:55 anonymous

reputation,GOSSiP: Tech Words the Day   2005 02 

Sendmail Milters   2005 02 

Stinger (McAfee): Tech Words the Day   2005 02 

MTAMARK: Tech Words the Day   2005 02 

Gmailfs: Tech Words the Day   2005 02 

RFC822: Tech Words the Day   2005 01 

Transferring mail to a new mail server   2005 01 

Some Remove me links really work   2004 12 

But I don't have an email password   2004 12 

Maia Mailguard: Tech Words the Day   2004 12 

Popper Fix for SCO 5.0.7   2004 11 

Cloning a directory structure without copying files   2004 10 

SCOoffice Mail Server   2004 10 

Kerio Mail Server Mailing Lists   2004 10 

New Linux Skills Tests Question   2004 10 

Spamassassin   2004 09 

Smart text reformatting with Perl   2004 09 

Sendmail VRFY   2004 09 

 
 
 
 
Microsoft just can't help itself   2004 08 

Unknown email user notification   2004 07 

POPFile -Multi-Platform Bayesian Pop Mail Scanner in Perl   2004 07 

Annoying Email Harvesters   2004 07 

Basic DNS: PTR records and why you care   2004 07  2009/11/13 12:44 TonyLawrence

Mail.app doubling characters   1997-2004 

mail returns   1997-2004 

mpack mutt mail mime attachment   1997-2004 

Google's Gmail   2004 06  2005/04/16 01:52 Quixilvr

Lurker email archiver/list manager   2004 06 

Roaming wireless access, spam   2004 06 

Gmail accounts   2004 06  2005/05/02 13:50 anonymous

Mozilla to the Rescue   2004 06 

SME server virus scan notification and double bounce   2004 05 

Postfix: The Definitive guide   2004 02 

Debugging a failing pop mail connection   2004 01 

Using the spooler to print to email   2003 12 

More using the spooler to print to email: email attachments   2003 12 

CleanCode Email   2003 11 

Cellular Wireless Access Tips   2003 10 

Corporate Open Source   2003 09 

Protecting corporate email by using multiple anti-virus scanners   2003 08 

Vacation Manager   2003 08  2007/12/20 17:03 TonyLawrence

Watch those domain names   2003 08 

My Details, Thank You, Wicked screensaver   2003 08 

 
 
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SME Server Local Networks and VPN's   2003 07 

Thoth Newsreader for Mac OS X   2003 06  2006/09/15 19:05 anonymous

Triple Threat   2003 05 

Securing POP mail access in Mac OS X   2003 03 

Spamassassin on Mac OS X   2003 03  2005/07/08 10:13 TonyLawrence

Notify Cell Phone of Incoming Mail   2003 02 

Too many messages for Outlook Express   2003 01 

Mac OS X Mail Client   2002 12 

Why run your own mail server?   2002 11  2008/08/26 06:52 Roarke

Sendmail Performance Tuning by Nick Christensen   2002 09 

Updating Sendmail   2002 09 

Noted in Passing June 2002   2002 06 

SME Server (E-Smith) Mail Forwarding, Lists, Etc.   2002 06 

Sendmail   2002 04 

Email attachment stripping   2001 12  2005/08/01 17:26 BigDumbDinosaur

Mozilla   2001 12 

PPP and DNS Configuration   2001 11 

Kevin Smith's scanmail   2001 11 

Configuring anti-spam in RedHat 7.0   2000 11 

Mail in a Virtual Domain   2000 10 

Majordomo   2000 02 

Replacing UUCP Mail   1999 09 

Spam   1999 07 

MMDF to Exchange- and Back!   1999 06 

Sendmail Theory and Practice   1999 04 

 
 
 
 
Setting up Internet Mail   1999 04 

Configuring a News Server   1999 01 

Perl mailsplit.pl splits mail files   1998 11 

How can I make a device that will print to a network printer or send email?   1997-2003 

How do I test a smtp mail connection?   1997-2003  2009/01/05 10:32 aravind

How do I get MMDF to send one copy of a message to many people?   1997-2003 

How can I send email attachments from the command line?   1997-2003  2009/07/17 11:45 anonymous

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