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FYI, my last three email campaigns worked without this issue, but I'll keep you informed if I see it again.

Hey popowich, Just wanted to give you a little more information about the issue from my end, figured it might help solve the issue as I noticed it again for our emailing today. I'm working for an economics firm and we have just under 200k contacts on our emailing list. We use an ESP...

I had the same problem the last two days with multiple Yahoo email addresses. Here's what I was looking at: smtp;553 Mail from x.x.x.x not allowed - 5.7.1 [BL23] Connections not accepted from IP addresses on Spamhaus XBL; see http://postmaster.yahoo.com/550-bl23.html [550] But checked up...