I've seen this too. Started earlier this week (Feb 19th). A big uptick in
the number of "4.7.500 Server busy. Please try again later..." responses
from Hotmail. I was assuming they were reputation related (spike in
complaints and/or sending volume maybe). But they seem to be especially
aggressive over the last few days. Maybe because Mr. Wise was busy at
M3AAWG.

Thanks,
Alex


Alex Burch
ActiveCampaign / Deliverability Lead
(800) 357-0402
abu...@activecampaign.com
1 N. Dearborn St., Chicago , Il 60602, United States
<https://www.facebook.com/activecampaign>
<http://www.twitter.com/activecampaign>
<https://www.linkedin.com/company/activecampaign-inc->
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