How do you actually diagnose deliverability problems when something goes wrong?
I manage email for a handful of clients and diagnosing deliverability is the part that still takes me the longest.
It almost always comes down to sitting with the data manually — complaint rates, bounce composition, DNS records, send history — and building a picture from pieces that don't talk to each other. It works but it's slow, and the insight often comes too late (after two or three bad sends, not before the first one).
A few things I'm genuinely uncertain about and would love to hear how others handle:
- Do you tend to catch problems proactively, or almost always reactively after a bad campaign?
- How much of your diagnosis relies on what the ESP surfaces vs. tools vs. external checks like Postmaster or MXToolbox?
- If you've tried any dedicated deliverability tools (GlockApps seems to come up a lot), what's actually useful vs. noise?
Not looking to sell anything — genuinely trying to understand whether the manual-analysis approach I'm using is standard, or whether there are smarter workflows I'm missing.