GlossaryGrowth & analytics
How do you keep cold emails out of spam?
Also called: email deliverability, SPF DKIM DMARC, outreach deliverability, sender reputation
Definition
Cold email deliverability is how reliably your outreach emails to people who haven't opted in reach the inbox instead of spam. It depends on authentication, sender reputation, spam complaints and the content you send.
Cold email deliverability, explained
Mailbox providers have tightened the rules. Google's email sender guidelines require all senders to Gmail to set up SPF or DKIM authentication, have valid forward and reverse DNS for sending domains or IPs, use TLS, format messages to the RFC 5322 standard, and keep spam rates reported in Postmaster Tools below 0.3%. Senders of more than 5,000 messages a day to Gmail addresses must also use SPF and DKIM and DMARC, align the From domain with SPF or DKIM, and support one-click unsubscribe with a visible unsubscribe link in marketing messages.
For cold outreach, the practical setup: send from a separate domain or subdomain so problems don't hurt your main domain's reputation; authenticate it with SPF, DKIM and DMARC; warm it up gradually with low volume; and keep daily volume modest per mailbox. Monitor spam complaints and bounces closely.
Content and targeting matter as much as DNS. Emails that are short, personal, relevant to the recipient and free of spammy formatting land better. Mass-blasting the same template to a scraped list is what spam filters and recipients both learn to block. Verify addresses before sending to keep bounces low, and stop emailing anyone who doesn't want to hear from you.
Laws apply too, and they vary by country. Rules like CAN-SPAM in the US and GDPR and ePrivacy rules in Europe set requirements on identification, opt-outs and, in some places, consent. Check what applies to you before sending.
Cold email can work for B2B startups with a clear ICP, but it's a precision tool. Ten well-researched emails beat a thousand generic ones for replies and for reputation.
Why it matters for founders
A misconfigured or abused domain sends everything to spam, including your product's password resets and receipts if they share it. Getting the basics right protects your whole email channel.
Example
A founder sets up a separate outreach subdomain with SPF, DKIM and DMARC, sends 20 personalized emails a day, and watches spam rates in Postmaster Tools. Replies stay steady, and the main domain's transactional email is unaffected.
Common mistakes
- Sending cold email from your main product domain.
- Skipping SPF, DKIM and DMARC.
- Blasting scraped lists with one template.
Sources
Checked
Related terms
- Ideal customer profile (ICP)An ideal customer profile (ICP) is a description of the type of customer, usually a company or person with specific traits, who gets the most value from your product and is most valuable to your business in return.
- Customer acquisition cost (CAC)Customer acquisition cost (CAC) is the total sales and marketing spend in a period divided by the number of new customers won in that period. It tells you what it costs, on average, to get one paying customer.
- DistributionDistribution is how a product reliably reaches the people who'll buy it: the channels, audiences, partnerships and assets that put it in front of customers repeatedly, not just once.
- Go-to-market (GTM)A go-to-market (GTM) strategy is the plan for how a product reaches and wins customers: the target market, the positioning, the channels that bring buyers, how they buy (self-serve or sales), and pricing.