Cold email
Cold email is an unsolicited but permission-conscious, personalized outreach email sent to a prospect you have no prior relationship with, for a business purpose. Done well it is targeted and relevant (not bulk spam) and complies with laws like CAN-SPAM and GDPR.
How it works
You build a targeted list, verify it, send personalized 1:1-style messages from warmed mailboxes, and follow up across a short sequence — measuring replies and positive responses, not just opens.
Why it matters
Cold email remains one of the most scalable B2B pipeline channels, but only when deliverability, personalization and compliance are right. Volume without those just burns domains.
What should the first cold email to a new prospect actually contain?
Four things, in under 120 words. A first line that proves you looked at them specifically (a hire they posted, a product change, a market they entered). One sentence on the problem you solve, framed as their problem rather than your feature. One piece of evidence, such as a named result from a similar company you are allowed to mention. And a single low-effort ask, usually a yes or no question rather than a request for 30 minutes.
Leave out attachments, images, tracking-heavy HTML and more than one link. Each of those adds spam-filter risk to a message from a sender the recipient has never heard of. The cold email templates library shows the structure applied to different buyer types, and how to write a cold email that gets replies goes deeper on the first line.
How many cold emails can a small team send per day without burning its domain?
Work it out per mailbox, not per team. A common conservative ceiling for a warmed mailbox is somewhere between 30 and 50 cold sends a day. Say you need 600 first-touch emails a week: that is 120 per working day, which is three or four mailboxes at 30 to 40 each, spread across one or two secondary domains that you use only for outreach.
Follow-ups count against the same ceiling, so a four-step sequence roughly quadruples daily volume once it is running. Teams that forget this hit their limit in week two and start pushing the per-mailbox number up, which is where reputation damage usually starts. The cold email ROI calculator helps size the list and mailbox count before you buy anything, and how many cold emails per day is safe covers provider limits in detail.
What separates a cold email from spam in the eyes of the law and the inbox?
Legally, in the US, CAN-SPAM does not require prior consent for commercial email, but it does require honest headers and subject lines, a physical postal address and a working opt-out that is honored within 10 business days. In the EU and UK the bar is higher: you generally need a documented legitimate interest for contacting a business address, and some countries restrict unsolicited email to individuals more tightly. None of this is legal advice, and the rules for your market are worth checking with counsel.
Mailbox providers apply a different test. They do not read your lawful basis; they watch whether recipients open, reply, delete unread or press the spam button. A cold email that is lawful but irrelevant still gets filtered once enough people mark it as spam. Relevance is what keeps it out of the spam folder, and a small, well-researched list is the cheapest way to get it.
When is cold email the wrong channel?
When the buyer does not live in their inbox. Field roles, many owner-operators and some regional markets respond better to a phone call or WhatsApp than to a fourth unread email. It is also a poor fit when you cannot find a verified work address for most of the list, because a high bounce rate will hurt the mailbox faster than the few replies help. In those cases, a sequence that opens with email and moves to a call or LinkedIn touch, as described in multichannel sequencing, usually reaches more people than email alone.
How Autocloz handles it
Autocloz runs cold email with warmup, deliverability monitoring, verification and rotation — then lets you add calling (free), SMS and WhatsApp (Growth) and LinkedIn (Scale) follow-ups in the same sequence, all on one CRM.
Free tools for this
No signup required — they run in your browser.
FAQ
Is cold email legal?
Yes, when done compliantly. In the U.S., CAN-SPAM requires accurate headers, a valid physical address and a working opt-out. The EU/UK (GDPR/PECR) is stricter and generally expects a legitimate-interest basis and easy opt-out.
How many cold emails can I send per mailbox per day?
Keep new mailboxes low (tens per day) and ramp gradually after warmup. Spreading volume across multiple warmed mailboxes protects deliverability better than blasting one.
Related terms
Cold email deliverability is the share of your outbound cold emails that actually reach the recipient's inbox (not spam, not blocked). It depends on domain authentication (SPF, DKIM, DMARC), sender reputation, mailbox warmup, list hygiene and content — not just whether the email was 'sent'.
DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email standard that tells receiving mail servers what to do with messages that fail SPF or DKIM checks — and sends you reports. It prevents spoofing of your domain and is now effectively required by Gmail and Yahoo for bulk senders.
Mailbox warmup is the practice of gradually increasing a new email account's sending volume while generating positive engagement (opens, replies, moving mail out of spam) so mailbox providers build trust in the sender before real campaigns ramp up.
Multichannel sequencing is automating a coordinated outreach cadence across more than one channel — for example email, then a LinkedIn touch, then a call, then a WhatsApp follow-up — from a single sequence, with per-channel timing and safety rules.
Want this applied to your setup?
This is a reference page. If you have a specific question about your own outreach, leave your email and a human on our team will reply.