deliverability
9 posts
How many cold emails can you actually send per day?
The safe number is per mailbox, not per account: 50/day default, 100 hard max, a 600s gap between sends. Here is the math to plan any daily volume.
How email warmup works: ramp, pools and limits
See how email warmup ramps from 10 to 40 messages a day, selects healthy pool partners, verifies placement and protects mailbox reputation.
Delivery rate vs inbox placement for cold email
A 99% delivery rate can still mean the spam folder. What delivered actually means, why it is not placement, and how to tell where your cold email lands.
SPF, DKIM and DMARC alignment for cold email
SPF and DKIM can both pass while DMARC alignment quietly fails. How to read your Authentication-Results header and confirm the From domain actually aligns.
How many cold email mailboxes and domains do you need?
Planning cold email volume comes down to per-mailbox budgets. Work backward from your daily target to the mailboxes, domains, and IP spread you actually need.
How to recover a burned cold email mailbox
A step-by-step recovery plan for a quarantined or blocklisted mailbox: confirm listings, fix the root cause and re-warm at 5 to 10 emails a day.
What complaint, bounce, and spam rate gets you throttled?
The numbers that actually trigger enforcement: Google spam under 0.10%, SES complaint under 0.1% and bounce under 5%. Plus the stricter bands we quarantine at.
Your send limit is a mailbox budget, not a server setting
People keep asking us to raise their daily limit. The honest answer is that the limit they are asking about does not exist.
Google bulk sender rules for cold email
SPF, DKIM, DMARC alignment, one-click unsubscribe, spam under 0.10%: Google and Microsoft now enforce the same bulk bar. The checklist, and the two gotchas.
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