If you're setting up a new sending IP, whether it's dedicated or a fresh pool assignment, you need an IP warming schedule that ramps volume slowly enough for Gmail, Yahoo, and Microsoft to build trust in it before you throw your full send at it. Skip the ramp and you'll likely see a chunk of that first big send land in spam, which then makes the next send harder too, so the schedule below is the one I walk clients through when they're moving to a dedicated IP.
A new IP address has no sending history attached to it, which means Gmail, Yahoo, and Microsoft have nothing to base a trust decision on, and no history reads as risk to a spam filter, not as neutral. If you point your full volume at a cold IP on day one, you're asking mailbox providers to make a trust call on a stranger sending thousands of emails at once, and their default response to that is caution: throttling, spam folder placement, or outright blocks. Warming works because it lets you build that history gradually, in small enough batches that a bad signal, a bounce, a complaint, doesn't overwhelm the small amount of good data the filters have to work with yet.
There's no single number that's correct for every sender, your right ramp depends on your list size and your typical daily volume at full send, but here's the shape I use as a starting point for a dedicated IP with a healthy, permission-based list. Day 1 to 3: start around 50 to 100 emails per day, sent only to your most engaged subscribers, the people who've opened or clicked in the last 30 days. Day 4 to 7: double roughly every day or two, moving toward 500 to 1,000 emails daily. Week 2: continue doubling every two to three days, working up toward a few thousand per day, still favoring your most engaged segments. Week 3 to 4: keep scaling toward your full daily volume, and by the end of week four you should be sending your normal send size if engagement has held up. If you're moving a genuinely large list, six figures or more, stretch this timeline closer to six to eight weeks rather than compressing it into four.
Volume isn't the only variable, content and audience selection matter just as much. Start with your most engaged subscribers only, people who've opened or clicked recently, since their behavior sends the strongest positive signal back to the mailbox provider. Avoid promotional-heavy sends during the warm-up and lean toward content people are likely to open and reply to or forward, transactional-style emails, welcome sequences, or genuinely useful newsletter content rather than a hard sales push. Hold off on re-engaging cold or dormant segments until the IP has some history built up; testing a sleepy list on a brand-new IP is one of the fastest ways to stall a warm-up before it gets going.
Check Google Postmaster Tools and Microsoft SNDS daily if you have access, since these give you a more direct read on reputation than opens and clicks alone. Watch your bounce rate, stay under 2 percent, ideally closer to 0.5, your spam complaint rate, stay well under 0.1 percent since Gmail and Yahoo both treat 0.3 percent as a hard ceiling now, and your open rate trend for the segment you're sending to. If any of these move the wrong direction mid-ramp, pause the increase, hold volume flat for a few days, and let engagement stabilize before continuing rather than pushing through on schedule regardless of what the data says.
The most common one is rushing the ramp because a launch date or campaign is on the calendar, which almost always backfires and costs more time than it saves. Second is sending to the whole list too early instead of starting with the most engaged slice. Third is ignoring bounces during warm-up and just letting the send finish, when a paused send and a quick list check would have protected the IP's reputation. And fourth is warming an IP with a list that hasn't been cleaned recently, since a cold IP has zero tolerance for the bounces and complaints an old, unmaintained list tends to generate; run it through a cleaning pass first if it's been a while.
Typically two to four weeks for a mid-size list, and six to eight weeks for very large lists, six figures or more, depending on how quickly engagement holds up as you increase volume.
No, shared IPs are already warm since other senders on the pool are actively sending, which is one of the trade-offs of shared IPs versus dedicated ones.
You risk immediate spam folder placement or throttling on a large chunk of your first sends, and recovering from that first impression usually takes longer than the warm-up would have.
The free Inbox Scorecard at /scorecard shows where your current sends are actually landing, and if you want someone reviewing the ramp with you in real time, a full audit at /audit covers that too.