Cold Email Marketing: Choosing Your Setup

What is cold email marketing?

Cold email marketing is outreach to people who haven't opted in and haven't been in touch with you. Each message goes to one named person at one company and is written around something that matters in their role. Newsletter email marketing starts from a different place. A newsletter goes to a list of people who subscribed. A cold email has to earn its place with a stranger in its opening lines. That one difference drives the rest: volume, tooling, legal footing and how you measure results. Our article on cold email meaning, definition and limits gives the full definition and covers the edge cases, such as when a referral or an event contact stops counting as cold.

Here's what doesn't work: loading a purchased list into a newsletter platform and sending one broadcast. Marketing platforms are built for opted-in audiences, so read your provider's acceptable-use terms before you import anyone who hasn't subscribed. A cold list also bounces more and draws more complaints than a subscriber list, and the receiving servers count both against the sending domain.

Which decisions decide a cold email setup?

Feature lists won't tell you much. You learn more by putting the same questions to every option. These questions decide whether your reputation stays in your hands:

1. 1 Whose domain is in the From address, and whose domain signs DKIM? DMARC checks that the visible From domain aligns with the SPF or DKIM domain. If a platform signs with its own domain, the receiving server isn't judging your domain's alignment and reputation.
2. 2 Which account and server actually send? When you send from your own mailbox or your own ESP account, bounces, complaints and suspensions land in an account you can see and fix.
3. 3 Where does the prospect list live? Know which system holds the contacts, who can export them, and where opt-outs are stored, so nobody who objected gets mailed again.
4. 4 How do follow-ups thread? A real follow-up carries In-Reply-To and References headers that point at the first message. Typing "Re:" into a new subject line doesn't create a thread.
5. 5 Does every message carry an opt-out? Google's email sender guidelines require one-click unsubscribe for bulk senders, and the FTC's CAN-SPAM compliance guide requires a working opt-out in commercial email.

Our guide to DKIM, DMARC and SPF for cold email senders walks through the DNS side of the first question step by step.

Which cold email tools are the realistic options?

Most cold email marketing stacks follow one of four approaches. The table compares them on the same properties. Features and plans change, so check each vendor's own documentation before you commit. Whichever you choose, send a test to a Gmail address and read the Authentication-Results header. You want to see dkim=pass with your own domain.

Approach	Named examples	Which domain sends	Where the list lives	Where it stops
Mail merge inside your mailbox	GMass (for Gmail and Google Workspace)	Your own mailbox and domain	A spreadsheet or the mailbox account	Bound by one mailbox's sending limits; sequencing and reply detection are lighter than in dedicated tools
Dedicated cold email sequencer	Smartlead, Saleshandy, Reply.io, Mailshake	Mailboxes you connect, normally on your own domain	Inside the sequencer	You handle mailbox count, warm-up and DNS yourself, and your contact data sits in one more place
Contact data plus sequencing	Apollo.io	Mailboxes you connect	Inside the data platform	Bought contact data still needs verifying before you send; bounces hit your domain, not the data vendor's
Your own ESP account, sending directly	Brevo	Your Brevo account and your authenticated domain	Brevo contacts or an external system	Built for campaigns, not one-to-one cold sequences; threading and per-person copy take extra work

No row is right for everyone. A founder writing to a few dozen accounts a week may be fine with a mail merge. A team running several mailboxes needs a sequencer's scheduling and reply detection. Our overview of cold email tool options, setup and follow-ups sorts more tools by the job they do.

How EmailFlow OS fits: one video, one version per recipient

EmailFlow OS, a EmailFlow OS product, takes a different approach to cold email marketing: personalised AI video email for B2B outreach. You record one video and upload it to EmailFlow OS. Then you connect your Brevo account and your sending domain and import your prospect list into EmailFlow OS. From that single recording, EmailFlow OS makes a personalised version for each recipient. It works per person, not per company, so two people at the same firm each get their own version.

Each version goes out from your own inbox, through your own Brevo account and your own sending domain. No shared platform sender sits in between. So the DKIM signature, the DMARC alignment and the reputation the receiving server judges all belong to a domain you control, and bounces and complaints show up in your own Brevo account. The receiving server still decides whether a message reaches the inbox, so the DNS records, warm-up and list hygiene covered in this article apply in full. The EmailFlow OS home page explains the personalised video email workflow.

Is cold emailing illegal in the US, and what applies in the EU?

Cold email isn't illegal in the US in itself. According to the FTC's CAN-SPAM compliance guide, the CAN-SPAM Act doesn't require prior consent for commercial email, but it does set conditions. Header information must not be false or misleading, and the subject line must not be deceptive. Where it applies, the message has to be identified as an ad and must include a valid physical postal address. It also needs a clear way to opt out, and opt-out requests have to be honoured promptly, within the deadline the FTC guide sets.

The EU is stricter, and the rules vary by country. Under the GDPR, using a business contact's personal data for direct marketing needs a legal basis. Legitimate interest is the one usually considered, and the GDPR gives recipients an unconditional right to object to direct marketing. The ePrivacy Directive leaves it to each member state to decide how email to business addresses is treated. Germany's Unfair Competition Act (UWG) treats email advertising without prior express consent as an unreasonable nuisance, and that holds in B2B too. No tool settles any of this for you. It depends on how you build the list and how you handle objections, so get legal advice for each country you send to.

Do cold emails still work in 2026?

We don't publish reply or conversion figures, and nobody can honestly promise you one. What has changed is the technical bar. Google's email sender guidelines require every sender to authenticate with SPF or DKIM. Senders Google classes as bulk senders also need SPF, DKIM and DMARC, one-click unsubscribe, and a spam rate kept under the threshold Google publishes, measured in Postmaster Tools. Most cold senders never reach bulk volume from one domain. Meeting the bulk rules anyway costs little, and it means your setup won't break when you scale.

What reliably fails: sending at full volume from a new domain on day one, mailing addresses you haven't verified, and loading too many messages onto one mailbox. Our article on how many cold emails per day per mailbox gives the volume ranges and explains why follow-ups count toward the cap.

Sales follow-up emails in cold email marketing

What is a sales follow-up email?

A sales follow-up email is the message you send to move a conversation forward, either after a first contact gets no answer or after a call or meeting. In cold email, it should be a reply in the original thread, with In-Reply-To and References headers pointing at your first message, so the recipient sees the context. Every follow-up should add something new, like a detail, a question or a resource, rather than just "checking in". Silence after a cold email isn't consent, and an opt-out ends the sequence at once. For timing and stop signals, see cold email follow-up timing, threads and limits.

Sales follow-up email template

1. 1 Opening line: point to the earlier email in one clause, without guilt ("Following up on my note about [topic]").
2. 2 Second line: add one new fact, such as a change at their company, a relevant constraint, or a question you didn't ask before.
3. 3 Third line: ask one easy question they can answer in a word ("Is [problem] on your list this quarter?").
4. 4 Closing line: give them an easy exit ("If this isn't relevant, tell me and I won't follow up").
5. 5 Signature: your full name, company and postal address, plus the unsubscribe link.

Sales email follow-up templates by situation

Situation	What the follow-up does	What to avoid
No reply to the first email	Adds one new reason, in the same thread	Repeating the first email in different words
After a call	Sums up the agreed next steps and the date	Pitching again what you already discussed
Prospect asked you to reconnect later	Refers to their timing and asks whether it still holds	Following up before the date they gave
Final message (breakup)	Says this is the last note and leaves the door open	Guilt-tripping or fake urgency

Sales follow-up email examples

• No reply: "Hi Maria, one thing I left out last week: your team has posted several SDR roles recently, which usually means your outbound domain is about to carry more volume. Is warm-up on your plate yet?"
• After a call: "Thanks for your time today, Tom. As agreed, I'll send the DNS checklist later this week and we'll go through it at our next call. Anything to add before then?"
• Breakup: "Hi Lena, I'll leave it here so I don't clutter your inbox. If sending-domain setup comes up later, just reply to this thread."

Our sales follow-up email template examples have more copy-ready versions, including post-meeting and breakup variants.

Questions people ask

? What is the difference between cold email and email marketing?

Email marketing goes to people who opted in, usually as a broadcast from a newsletter platform. Cold email goes one-to-one to someone you've had no contact with. That means it needs a lawful basis without a subscription, low volume per mailbox, and a reason that fits that particular person. The metrics differ too: newsletters track list growth, while cold email tracks replies and meetings.

? Should I use my main domain or a separate domain for cold email?

Both are your own domains, so the trade-off is risk against recognisability. A separate outreach domain keeps complaints away from the domain your invoices and support mail come from. Your main domain is more familiar to recipients. Whichever you use, it needs its own SPF, DKIM and DMARC records and a gradual warm-up before it sends full volume.

? How many follow-ups should a cold email sequence have?

There's no standard number. Stop at an opt-out, a bounce or a clear no, and space messages so each one adds something new. Every follow-up counts toward the sending mailbox's daily volume, so a longer sequence means one mailbox can reach fewer new prospects before it goes over a safe daily volume.