Why is there a whole page about this?+
Because deliverability is the thing that actually breaks, and it is the reason people are frightened of moving. Every other part of an email tool is a preference. This part decides whether the message arrives.
What do I have to do before my first send?+
Authenticate the domain: SPF, DKIM and DMARC. Pulse gives you the exact DNS records, checks them, and explains in English what each one is doing. Google and Microsoft both require this from bulk senders now, and an unauthenticated domain is not a slow start, it is a wall.
What is warmup, and can I skip it?+
Proposed approach: authenticate first, preserve suppressions, and increase volume only as relevant delivery and complaint evidence supports it. There is no fixed warmup or migration duration that guarantees inbox placement.
What are the thresholds that matter?+
Google recommends a Postmaster Tools spam rate below 0.1%, never reaching 0.3%. This is not a universal Microsoft threshold. See the provider sources for the applicable scope; no live measurement is made here.
What happens to bounces?+
Hard bounces are removed from the list automatically. Soft bounces are retried and then retired. A list that is not cleaned is a reputation being spent slowly.
Do I need a dedicated IP?+
Proposed approach: authenticate first, preserve suppressions, and increase volume only as relevant delivery and complaint evidence supports it. There is no fixed warmup or migration duration that guarantees inbox placement.
What if my domain reputation is already damaged?+
Proposed approach: authenticate first, preserve suppressions, and increase volume only as relevant delivery and complaint evidence supports it. There is no fixed warmup or migration duration that guarantees inbox placement.