Showing posts with the label delays

Understanding 4xx Deferrals

Let us take a moment to talk about SMTP status codes. Specifically, the kind that start with the number 4. Say you've just sent out your latest email, whether it be a newsletter or marketing campaign. You know that it should land in the inbox right about ... now. But this time ... nothing. It's not in your Gmail, Yahoo, or Outlook test accounts. No bounce. No delivery. Just ... nothi…
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Seeing "recipient getting too much mail" delays at Gmail?

Here's a question I get asked from time to time: What does THIS Gmail SMTP delivery temp failure error actually mean? Here's the error in question: 450, "4.2.1", The user you are trying to contact is receiving mail at a rate that prevents additional messages f…