Many of the operational goals of a commercial spammer aren’t related to email delivery at all, rather they revolve around optimizing ROI and minimizing costs. That’s even more true when the spammer isn’t trying to sell their own product, rather they’re making money by sending spam for other companies. Most legitimate network providers pay at least lip service to not...
Dear Laura, Your blog is the best. Nothing else compares for solid deliverability discussion. I’ve frequently read these two articles: I need IP addresses to avoid throttling I need to deliver my mail fast They are incredibly helpful. But I don’t think you’ve ever answered this question directly: “Is it detrimental to use an IP pool instead of a single, static IP? For...
Can a bad SPF record ruin your delivery, even though all your mail still passes SPF? Yes, it can. One of our clients had issues with poor delivery rates to the inbox at gmail and came to us with the theory that it was due to other people using their domain to send spam to gmail. This theory was based on ReturnPath instrumentation showing mail “from” their domain coming from other IP...
Today’s Wednesday Question comes from Zaib F. What causes the Spamhaus CSS listing in your experience other than Sender using multiple sets of IPs, to look as if they are a valid sender. Do you think a Spamtrap plays a role? I’ll preface this by saying I don’t know what the specific Spamhaus criteria are for listing on the CSS. I do know the overall goal of the CSS list is to...
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