Cold email still works. Lazy cold email doesn't.
Most campaigns fail for boring reasons. The emails land in spam, they go to the wrong people, or they say nothing worth replying to. Fix those three things and you're already ahead of most of what your prospects see in their inbox every morning.
This is the setup I use for my own outreach, and the workflow I built Sendrise around.
Part 1: Infrastructure that protects your main domain
Never send cold email from your main domain. If your company is acme.com, buy a couple of lookalike domains such as getacme.com or tryacme.com and send from those. If one gets burned, the domain that handles your invoices, password resets and client email stays safe.
For each sending domain:
- Authenticate it with SPF, DKIM and DMARC. Gmail and Yahoo have required this from bulk senders since February 2024, and Microsoft brought in similar rules for Outlook.com in 2025. Google's email sender guidelines are worth reading once, slowly.
- Point the root domain at your main website with a redirect, so a curious prospect who types it in lands somewhere real.
- Set up two or three mailboxes per domain, with real names, profile photos and normal signatures.
- Warm up new mailboxes for two to three weeks before you send a single campaign.
- Keep volume low. I stay around 30 to 50 cold emails per mailbox per day. If you need more volume, add mailboxes. Don't push harder on the ones you have.
Then watch your complaint rate. Google asks bulk senders to stay under 0.3% spam complaints, and you want to be well under 0.1%. Postmaster Tools shows you the number for Gmail.
This part is dull. It's also the part that decides whether anything else in this playbook matters.
Part 2: Your list is your targeting
A great email sent to the wrong person is still spam.
Start with a tight picture of who you want: industry, company size, location, the role you want to reach, and a trigger. Triggers are the secret. A company that's hiring, raising money, launching something or opening in a new city has a reason to talk to you this month, not someday.
A few rules I don't break:
- Verify every email before it goes into a campaign. Bounces damage your sender reputation faster than anything else, so keep the bounce rate under 2%.
- Segment by trigger, not just job title. "Agencies hiring their first SDR" is a segment. "Agency owners" isn't.
- Keep segments small, 100 to 300 contacts each. Small segments let you personalize properly and learn fast.
- Don't buy giant lists. You'll spend more time cleaning them than they're worth, and the bounces will hurt your domains.
Part 3: Copy that gets replies
A cold email has one job: start a conversation. It doesn't need to close a deal, explain your whole product or list every feature.
What works for me:
- Subject line: short, lowercase, specific. "question about your hiring" beats "Boost your revenue 10x" every time.
- First line: about them, not you. Mention the trigger.
- Body: one problem, one result, one line of proof.
- Call to action: an easy question. "Worth comparing notes?" gets more replies than "Can we book a 30-minute demo?"
- Length: under 100 words. If it scrolls on a phone, cut it.
Here's the shape I use:
Subject: your new SDR hire
Hi Priya, saw that [Agency] is hiring its first SDR. Congrats.
Most agencies I speak to lose a new SDR's first 90 days to building lists and writing sequences instead of booking calls. We help new SDRs launch verified, personalized campaigns in their first week.
Worth comparing notes?
Notice what's missing. No "I hope this email finds you well". No company history. No three paragraphs of features. Just a reason to reply.
AI can help you personalize at scale, and that's a big part of what Sendrise does. But read what it writes before it goes out. AI personalization that gets a detail wrong is worse than no personalization at all.
Part 4: Follow-ups and measurement
Most replies come from follow-ups, not from the first email.
- Send three or four follow-ups, three or four days apart. Each one should add something new: a short case study, a sharper question, a useful resource. Never "just bumping this up".
- Stop the sequence the moment someone replies. Automatically.
- Track replies, not opens. Open tracking is unreliable now that mail apps prefetch images, and tracking pixels can hurt deliverability.
- Aim for a bounce rate under 2% and a positive reply rate of 1 to 3% on a cold list. If you're below that, fix the list before you touch the copy.
Part 5: Stay on the right side of the rules
I'm not a lawyer, and the rules change from country to country. In the UK, cold email to people at limited companies is generally allowed if it's relevant to their job, you say clearly who you are and you offer an easy way to opt out. Emailing sole traders is stricter, and several EU countries, Germany for example, are stricter again. In the US, CAN-SPAM asks for an accurate sender, an honest subject line, a postal address and a working unsubscribe.
Whatever the law says where you are, remove people who opt out within a day and never email someone again after they've asked you to stop.
The weekly routine
Cold email works best as a habit, not a one-off project:
- Monday: build and verify next week's segment.
- Tuesday: write the sequence and get someone else to read it.
- Wednesday and Thursday: launch, then check bounces and replies every day.
- Friday: look at the numbers, kill what isn't working, do more of what is.
Run that for a quarter and you'll know more about your market than any survey could tell you.
Pair it with LinkedIn
The best outbound I've seen uses two channels: a cold email, then a LinkedIn connection request a few days later, then a message that mentions the email. Different channels, one conversation. My guide to LinkedIn outreach covers that side, including how to keep your account safe.
The playbook works with any tool. I built Sendrise to run this whole workflow in one place (find leads, verify them, write personalized emails with AI and manage campaigns), but the discipline matters more than the software.
