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    Yahoo Intermittent and Erroneous IP Based blocks - 553 5.7.1 [BL21]

    more confirmation that others are experiencing this problem and that yahoo is at least trying to work on solving it: The Email Delivery Guru - Yahoo Issues
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    Yahoo Intermittent and Erroneous IP Based blocks - 553 5.7.1 [BL21]

    its not much help, but there is this related blog entry on the spamhaus site now http://www.spamhaus.org/news.lasso?article=644 its basically saying there's nothing wrong on the spamhaus side and if your IP address is not listed in Spamhaus blacklist , then there is nothing spamhaus can...
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    Yahoo Intermittent and Erroneous IP Based blocks - 553 5.7.1 [BL21]

    we're a jobs website in Asia and we do about 1.5 - 2million emails a day (mostly job opportunity alert emails).. I have done the bulk mail declaration in the past... but not the particular form you mentioned...(yahoo's had several iterations of this declaration, i don't bother to keep...
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    Yahoo Intermittent and Erroneous IP Based blocks - 553 5.7.1 [BL21]

    Re: Yahoo Intermittent and Erroneous IP Based blocks Thanks for posting this... i've also been experiencing this for about 20 -30% of our deliveries to the yahoo domain since about the 22nd of may 2009...
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