How To Block LinkedIn Intro On Your Servers

LinkedIn tried to give iPhone users a quick way to view the LinkedIn profiles of the people they communicate with through e-mail, but to do so they’ve routed all e-mails through their own servers. That’s a GIANT security no-no for so many different reasons. I’d recommend all companies immediately block the mail servers LinkedIn Intro uses by blocking:

IMAP: imap.intro.linkedin.com

SMTP: smtp.intro.linkedin.com

 

1 Comment How To Block LinkedIn Intro On Your Servers

  1. Steve Shipway

    You can block IMAP (143) inbound to your mail servers from mail.intro.linkedin.com (a block of 18 IP addresses) which will basically stop the IMAP proxy from working. Blocking Submission (587) outbound to these IPs at your border is also a good idea.

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