A pre-flight checklist before raising daily send caps after a clean 14-day window

Fourteen clean days feels like permission to double volume. It is not. It is permission to run a pre-flight, then raise caps in a controlled step.

Agencies burn client domains by skipping that check. MailReach's warmup guidance still caps cold B2B sends around 100 per inbox per day and recommends raising volume by about 10 to 20% at a time when metrics hold. LiteMail's 2026 warmup monitoring checklist and WarmupIP's metric table both say the same operational truth: bounce and complaint spikes mean pause, not celebrate.

What "clean" has to mean

Before anyone touches the dial, the last 14 days for that client workspace should show:

• Hard bounce rate under about 2% per mailbox (pause and clean above that)
• Spam complaint rate under the thresholds you monitor (Gmail Postmaster pressure sits near about 0.1%; many warmup monitors treat about 0.05 to 0.08% as an early warning band)
• Authentication stable: SPF, DKIM, DMARC aligned after any DNS change
• No new blacklist hits on the sending domain or critical IPs
• Seed placement stable week over week on the providers that match the recipient mix
• Send pattern linear: no single-day blasts that dwarf the rest of the fortnight

MailWarm's ramp notes add a useful rule of thumb: resume increases only after two to three stable days of good delivery when something previously wobbled. A green average over 14 days with a red day 13 is not clean.

The pre-flight checklist

Print this into the client workspace and require a named owner to check each box:

1. Confirm the window. Same domain, same primary mailboxes, same major sequence family. Do not blend a quiet brand mailbox into a cold domain's story.
2. Re-check DNS and auth. Any ESP, DKIM selector, or forwarding change in the window resets the clean claim until verified.
3. Pull bounce classes. Separate hard bounces, soft bounces, blocks, and complaints. Soft bounce creep often predicts the next hard-bounce problem.
4. Read Postmaster for the same UTC dates as your send logs. Spam rate trend, delivery errors, compliance flags, data freshness.
5. Read the latest seed matrix. Provider-level, not one blended inbox score.
6. Confirm list hygiene on the next segment. Verified addresses, suppressions applied, role accounts handled per client policy.
7. Pick the raise size. Prefer +10 to 20% per mailbox, not a jump from 40 to 100.
8. Set a kill switch. If bounce or complaint thresholds trip in the next 48 to 72 hours, roll back to the prior cap automatically.
9. Tell the client the decision in one line. Raising Client A from 40 to 48 per day per mailbox after a clean 14-day window.

MailReach is explicit that ISP filters prioritize consistency over speed. A neat staircase beats a victory spike.

What to refuse even after 14 green days

• Raising caps because the client asked to just send more without the checklist
• Raising only the hottest sequence while ignoring mailbox-level bounce on a sibling campaign
• Opening a second sending domain in the same breath as a volume jump without a separate warmup plan
• Counting warmup-network engagement as proof that cold ICP mail will tolerate the new cap

After you raise

Watch the next three send days harder than the prior two weeks. LiteMail suggests checking live cold inboxes every 48 to 72 hours once campaigns are running. If placement drops or hard bounces climb, revert first, diagnose second.

GTM keeps per-client daily send caps, send windows, and compliance gates inside isolated workspaces. Caps are a control surface, not a vanity metric. Raise them when the pre-flight passes, not when the calendar says day 15.

If you want outbound with per-client send limits and deliverability controls built in, join the waitlist.