Comments on: Comcast Email Throttle/Sending Limit per Hour Based Off Sender Score http://nitrometrics.com/blog/comcast-email-throttlesending-limit-per-hour-based-off-sender-score/ Data Driven Internet Marketing Fri, 08 Jan 2010 12:30:49 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: J.D. http://nitrometrics.com/blog/comcast-email-throttlesending-limit-per-hour-based-off-sender-score/comment-page-1/#comment-42 J.D. Wed, 23 Dec 2009 19:15:22 +0000 http://www.nitrometrics.com/blog/?p=144#comment-42 Most of the time, if you look at the text portion of the SMTP reply (rather than only the numeric portion), it'll tell you whether the temporary failure is due to an overloaded system, rate limiting as you described above, or some entirely different reason. For Comcast specifically, the content of the text portion is described here: http://postmaster.comcast.net/mail-error-codes.aspx Most of the time, if you look at the text portion of the SMTP reply (rather than only the numeric portion), it’ll tell you whether the temporary failure is due to an overloaded system, rate limiting as you described above, or some entirely different reason.

For Comcast specifically, the content of the text portion is described here: http://postmaster.comcast.net/mail-error-codes.aspx

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