cold email deliverability
Your cold email isn't ignored. It's filtered.
Deliverability is decided before anyone reads your subject line. Here's the pre-send checklist that keeps you in the inbox, the honest bounce-rate numbers to hold yourself to, and why verification beats every warm-up product on the market.
The pre-send checklist
Work top to bottom. Steps one and two account for most of the damage, and most senders skip both.
1. Authenticate the domain
SPF, DKIM and a DMARC policy on the exact domain in your from-address. Check alignment, not just presence — a passing SPF record on the wrong domain does nothing for you.
2. Verify every address
Run each contact through verification and drop anything unverified or risky. A catch-all domain that 'accepts' everything is not a verified address.
3. Ramp, don't blast
A new mailbox should start in the tens per day and climb over weeks. Steady daily volume looks like a person; a thousand-email Tuesday looks like a list purchase.
4. Send plain, human email
No tracking pixel farms, no image-only bodies, no link shorteners, one link at most. Anything that looks like a newsletter gets filtered like one.
5. Make replying easy and leaving easier
A real signature, a real inbox, and a plain one-line opt-out. Spam complaints hurt far more than a lost prospect.
6. Watch the rate, not the total
Bounce rate, complaint rate and reply rate per campaign are your dashboard. A rising bounce rate is a targeting problem showing up as a delivery problem.
The numbers to hold yourself to
Placement problems show up in rates long before they show up in replies.
| Metric | Healthy | Investigate | Stop sending |
|---|---|---|---|
| Hard bounce rate | Under 2% | 2-5% | Above 5% |
| Spam complaint rate | Under 0.1% | 0.1-0.3% | Above 0.3% |
| Reply rate | 3%+ | 1-3% | Under 1% — fix targeting |
| Daily volume, new mailbox | Ramp from ~20/day | Doubling weekly | Hundreds on day one |
Thresholds reflect widely published mailbox-provider guidance for bulk senders; your own history matters more than any benchmark.
Six reasons cold email lands in spam
Unverified lists
The number one cause. Scraped and guessed addresses bounce, and bounces cost you inbox placement for the good addresses too.
Missing authentication
No DKIM alignment means providers can't confirm you sent the mail. They resolve that doubt against you.
Volume spikes
Zero to hundreds overnight from a fresh mailbox reads as compromise or abuse.
Bad targeting
Emailing people with no plausible use for your product produces complaints, and complaints are the fastest way into the spam folder.
Template smell
Identical bodies at scale, heavy HTML and multiple tracked links all pattern-match to bulk mail.
Shared sending pools
Send through someone else's IP reputation and you inherit whoever sent before you.
How fkngrow handles this for you
Deliverability isn't a setting you toggle — it's the order the steps happen in. fkngrow verifies every contact before it's eligible to be emailed, skips risky and catch-all addresses instead of gambling on them, sends through your own connected Gmail so you keep your own reputation rather than a shared pool, and caps how many emails Autopilot sends per day. When verification eliminates a chunk of a list, discovery keeps going until the day's target is met with real, reachable people — so protecting your domain doesn't mean sending less.
Deliverability FAQ
What is cold email deliverability?
Deliverability is whether your email reaches the inbox at all. It's decided before anyone reads the subject line, by your authentication records, your sending history, your bounce rate and how many recipients mark you as spam.
What bounce rate is too high?
Treat anything above 2% as a problem and above 5% as an emergency. Mailbox providers read bounces as a signal that you bought a list, and they throttle or filter accordingly. Verifying every address before sending is the only reliable fix.
Do I need SPF, DKIM and DMARC for cold email?
Yes. Google and Yahoo require authenticated mail from bulk senders. Without SPF and DKIM aligned to your sending domain and a published DMARC policy, a share of your mail is filtered before content is even evaluated.
Should I use a separate domain for cold email?
If you're sending real volume, yes — a subdomain or lookalike domain keeps a bad campaign from damaging the domain your customers and invoices use. At low volume from your own inbox, sending from your primary domain is usually fine and lands better.
Does email warm-up actually matter?
Ramping matters more than any warm-up product. Start at a low daily count from a new mailbox and increase gradually over a few weeks. Sudden volume from a cold mailbox is the single loudest spam signal you can send.
How does fkngrow protect deliverability?
Every contact is verified before it can be sent to, risky addresses are skipped rather than gambled on, sends go through your own connected Gmail rather than a shared pool, and Autopilot enforces a daily cap instead of blasting.
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