Reach
Sending safety and limits
The sending envelope Unobits calculates for every sender, warm-up, workspace hours, how credits govern volume, and why a campaign pauses itself.
On this page
Every sender has a limit to how much it can safely send before inbox providers start treating it as spam. Reach works that limit out for you and enforces it, so a campaign can never burn a mailbox's reputation in an afternoon.
The sending envelope#
Once a mailbox has sent through Reach, Reach reads what the mailbox is, how old it is and what has happened to its mail — bounces, complaints, replies — and works out a safe daily volume. That number is the limit: a sender stops for the day when it reaches it.
- The limits are worked out, not chosen. Nobody can raise them.
- You can lower them. A daily limit you set on a mailbox can only make its limit smaller, never larger.
- They fall on their own when a sender starts having trouble.
Reach → Settings → Sending safety shows what Reach will let you send right now: each sender's current safe volume, what will stop a campaign, and what has been stopped.
Warm-up#
New mailboxes start low and warm up — their safe volume grows day by day as they send without trouble. Warm-up is on by default. It is the one control that raises limits: switching it off for a mailbox removes the ramp, and Reach shows everywhere that the mailbox is running without one. Leave it on unless the mailbox has a long, clean sending history.
Sending windows and pacing#
- Workspace hours — in Reach → Settings → General, set when messages may go out (days, times and time zone). A message due outside the window waits for it rather than being dropped.
- Per-mailbox hours override the workspace default.
- Spread sends by a number of minutes so messages do not all leave at the window's first second, and set the least time between sends on a mailbox.
Credits govern volume#
Outbound campaign messages draw on your organization's system credits. An email costs little; an SMS costs more, per segment. Credits are shared across every sender in the workspace, so the total you can send is one honest number for the whole organization.
If credits run out, the next sends are rescheduled until credits are available — nothing is dropped.
Sender health and what stops a campaign#
Reach rates each sender from its last 30 days of real sends:
| State | When | Effect on the safe volume |
|---|---|---|
| Healthy | Nothing below applies | Full calculated volume |
| Worth watching | Bounce rate above 3% | Reduced to 60% |
| At risk | Bounce rate above 5%, or complaint rate above 0.1% | Reduced to 25% (bounces) or 50% (complaints) |
| Stopped | Bounce rate above 10%, or complaint rate above 0.3% | Nothing sends |
When a sender is stopped, Reach pauses every active campaign sending from it before the next send, and records the reason on the campaign — so a paused campaign always says whether a person paused it or Reach did, and why. These thresholds are Reach's current settings and are shown on the Sending safety page; they apply even to a mailbox whose warm-up was switched off.
To recover, find the cause (a bad list, a broken domain record, a spam-flagged message), fix it, and let the sender's history improve before sending at volume again.