How to Make Sure Your Intent Based Cold Emails Get Seen

Guest post by Emmett, CEO of MailStrike.

Your leads engaged with your topic this week. If your first email lands in spam, that signal is wasted.

Use dedicated sending domains

Never send cold email from your main company domain. If it gets flagged, your invoices, support replies and team email go to spam with it. Buy separate sending domains that look like your brand, such as getyourbrand.com or tryyourbrand.com, and keep your main domain for real business.

But dedicated domains have a built-in problem. A normal business domain sends and receives email all day: customers reply, colleagues forward, newsletters get opened. That steady, two-way engagement is what mailbox providers trust.

A sending domain has none of it. It sends hundreds of emails to strangers and gets a handful of replies back. Its send-to-reply ratio looks terrible, because it is terrible. To a provider, that pattern looks a lot like a spammer, which is why sending domains burn so easily and need careful handling.

Get the setup right, keep it current

Sending rules change constantly. Google and Microsoft adjust their filters without announcing it, and what worked six months ago can burn domains today. Advice in old blog posts goes stale fast, so talk to people who watch placement data every week before you lock in your setup.

As of today, this is the setup that works best:

• Mix Google Workspace and Microsoft 365 mailboxes. Most of your prospects use one of the two. Sending from both spreads your risk and tends to land better with each provider.
• Use 3 mailboxes per domain. More mailboxes on one domain means more volume tied to one reputation.
• Send around 12 emails per mailbox per day for the first 2 months. New domains have no history, so start slow.
• Then move to around 20 emails per mailbox per day. Once the domain has a track record, you can raise volume.

Those limits include follow-ups. A 3-step sequence to 4 new leads is 12 emails, not 4.

How many domains you need

With 3 mailboxes per domain, one domain sends about 36 emails a day in the first 2 months and about 60 a day after that. Here is what common volumes take:

Sending on weekdays only, 1,000 emails a day is roughly 22,000 a month. Buy for the first 2 months: the extra capacity is what lets you grow volume later, and it gives you spare domains to fall back on if one needs a rest.

Validate every email before you send

Bounces are one of the fastest ways to burn a sending domain. Every hard bounce tells the provider you are emailing addresses you never had a relationship with. Aim to keep hard bounces under 2%, and lower is better.

Email finders are good, but not perfect. People change jobs, companies change domains, and some servers accept everything and bounce later. Run every list through a dedicated validation tool before it reaches your sending tool, even emails your finder marked as found.

Be careful with catch-all addresses, which accept any email and can't be fully verified. Send to them from a separate campaign at lower volume, or skip them if your bounce rate is already climbing.

Why traditional warmup falls short

Most warmup tools work the same way: your mailbox swaps emails with a pool of other mailboxes, and they open and reply to each other automatically. The problem is that providers have learned to spot it. The messages follow patterns, the pools often include cheap SMTP accounts, and the engagement is easy to tell apart from real conversations. Much of that activity is simply discounted, so your domain looks warm in the dashboard but not to Google or Microsoft.

Full disclosure: this is the problem I co-founded MailStrike to fix. Our network uses only real Google and Microsoft accounts, with context-aware AI-written conversations that read like normal business email. That builds reputation providers actually count, which is what a sending domain with no natural engagement needs most.

Pause at the first spam spike

A domain rarely burns overnight. It slides: placement drops a little, then a little more, until everything lands in spam. Catch it early and you can recover it. Wait a week and it is usually gone.

Watch inbox placement and spam rates for every domain, not just your campaign totals. When you see a spike:

1. Pause every mailbox on that domain, not just the one that looks bad. Reputation is shared across the domain, so one mailbox in trouble means all of them are at risk.
2. Keep warmup running. Positive engagement is what pulls the reputation back up.
3. Move the campaign to a spare, already-warm domain at low volume so your intent leads still hear from you while the signal is fresh. Fix the cause before you resume.
4. Test placement before you resume, and restart at a lower volume.

Pausing feels like losing days. Burning a domain costs you weeks, plus the time to set up and warm a replacement.

A warm list needs a warm inbox

Intent data tells you who to email and when. Your sending setup decides whether they ever see it.

Use dedicated domains, but treat them as fragile. Mix Google and Microsoft mailboxes, keep volumes low, validate every address, warm with engagement providers actually trust, and pause at the first sign of trouble. Get that right, and every lead your intent list finds gets a real chance to reply.

Emmett is the CEO of MailStrike, an email deliverability and warmup platform.