Why did my sending slow down or pause?
Warmerly deliberately holds back or stops campaign sending when the numbers say your reputation is at risk. Once a domain starts landing in spam, everything from it suffers, including mail that had nothing to do with the bad list. Stopping early is far cheaper than recovering later, so Warmerly does it for you and emails you the reason.
There are four separate mechanisms. Find yours below.
1. The volume ramp (new mailboxes and new campaigns)
A new mailbox is not allowed to send its full daily limit on day one. Two things hold it back:
- The warmup ramp raises what a mailbox is allowed to do over its first 30 days. See How warmup works.
- The campaign volume ramp starts a campaign small and increases each sending day. It is switched on by default when a campaign is created and your mailboxes are less than 14 days into warmup, and you can change it on the campaign's Settings tab under Advanced, with the toggle Ramp volume up gradually. By default the first day is 3 emails per mailbox, then 1 more each sending day, up to a ceiling of 15. Weekends and other days you do not send on do not count as sending days.
This is not a fault. Your mailbox's daily sending limit (Settings tab of the mailbox) is only a ceiling, and a ramp can only hold sending below it, never above.
2. The bounce brake (sending is throttled)
If a mailbox's bounce rate over the last 7 days climbs, Warmerly cuts that mailbox's daily campaign volume before it has to stop it:
| Bounce rate over 7 days | Daily volume |
|---|---|
| Under 2% | Normal |
| 2% to 3% | 75% of normal |
| 3% to 5% | 50% of normal |
| 5% and above | 25% of normal |
The brake only applies once a mailbox has sent at least 25 emails in that 7-day window, because a few bounces on a tiny sample say nothing. It never drops below 1 a day, and it releases by itself as the bounce rate falls. The fix is on the list side: verify your addresses before you send.
3. Automatic pause for high bounces (campaign, then mailbox)
At a bounce rate of 7% or more, or when 30% or more of the leads tried were rejected as undeliverable, over the last 7 days (again only after at least 25 sends), Warmerly pauses:
- The campaign first. A bad list makes every mailbox that touches it look bad, and pausing the mailboxes would stop your other campaigns too. The campaign's status becomes paused. You resume it from the campaign page once the list is fixed.
- A mailbox next, only if it is still bad after the bad campaigns are stopped. That means the problem follows the mailbox, not the list.
You get an email with the numbers that caused the pause and what to do. The pause happens even if that email cannot be sent.
A mailbox paused for reputation keeps warming
A mailbox taken off campaigns for reputation is not stopped. Its status stays active, warmup keeps running (and is turned back on if it was off), and the badge on Accounts shows Recovering. The mailbox page says warmup is still running and that it will return automatically. Warmup is what rebuilds the reputation, so stopping it would remove the way back.
The mailbox returns to campaigns by itself when all of these are true, checked hourly:
- it has been off campaigns for at least 3 days,
- it has a recent health score (from the last 3 days) of 70 or more,
- its bounce rate is back under the pause level.
It comes back small: 5 emails a day, climbing by 5 a day, for its first 5 days, on top of any other limit. You get an email when it returns. If you press Resume yourself, the same gentle return applies, because choosing to send again is not a reason to jump back to full volume.
4. Automatic pause when a provider refuses the message as spam
If a mailbox's messages are refused by the receiving server as spam or policy (rather than because the address does not exist), those leads are not marked bounced and are not suppressed. They are retried later. If a mailbox gets 3 of these refusals within 24 hours, it is taken off campaigns the same way (Recovering), and you are emailed. Nothing reached your recipients and your leads are fine. Look at your copy (links, spammy phrases), check the domain health card and ask your mail provider whether they are filtering outbound mail.
Other reasons sending stops that are not reputation
- The mailbox is Paused or Disconnected. See What do my mailbox's health score and status mean? and Reconnect a mailbox. A health score under 60 for two days also pauses a mailbox entirely, and it resumes itself after about three days.
- Billing or plan limits. See Plans & limits.
- Outside the sending window or days. See the troubleshooting checklist.
What Warmerly does not do
- It does not auto-pause on inbox placement results or spam complaints, because those signals are not reliable enough to stop your sending automatically. It acts on bounces and provider refusals.
- It cannot see spam complaint rates from Gmail or Microsoft directly.
- It cannot un-pause a campaign for you. Campaign pauses are resumed by you.
Common problems
"My mailbox says Recovering and I did not do anything." That is the automatic pause above. Nothing to do: it returns by itself. Meanwhile other mailboxes on the campaign keep sending.
"I resumed the mailbox and it barely sends." The return ramp is 5 emails a day, rising by 5, for 5 days. That is intentional.
"The brake is throttling a mailbox but my list is fine." Bounces count from any campaign that mailbox sent in the last 7 days, and hard bounces from old addresses are the usual cause.