http://www.allspammedup.com/2009/06/new-spam-attack-features-blank-messages/ Wed, 08 Feb 2012 11:22:23 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://www.allspammedup.com/2009/06/new-spam-attack-features-blank-messages/comment-page-1/#comment-3245 King Fri, 25 Sep 2009 12:47:24 +0000 http://www.allspammedup.com/?p=1137#comment-3245 This is not new, spammers have been verifying e-mail addresses this way for many years. It isn't actually that they send an empty message, they connect to the SMTP port of your ISP and send a (fake) "mail from" command followed by a "rcpt to: address" command and check if they get a return code (error). No error means valid address. They break the connection at that point, and the SMTP daemon delivers what it perceives was an empty message since no "data" command was given. This is not new, spammers have been verifying e-mail addresses this way for many years. It isn’t actually that they send an empty message, they connect to the SMTP port of your ISP and send a (fake) “mail from” command followed by a “rcpt to: address” command and check if they get a return code (error). No error means valid address. They break the connection at that point, and the SMTP daemon delivers what it perceives was an empty message since no “data” command was given.

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