The best sequence in the world is worthless if it lands in spam. Here's the deliverability checklist most teams skip until it's already a problem.
SPF tells receiving mail servers which servers are authorized to send on behalf of your domain. DKIM adds a cryptographic signature verifying the message wasn't altered in transit. DMARC tells receiving servers what to do if SPF or DKIM checks fail, and publishes a policy mailbox providers increasingly require for bulk senders. Missing or misconfigured DMARC in particular has become a frequent cause of inbox placement failures as major providers have tightened requirements for anyone sending at volume.
Cold outbound should run from a dedicated subdomain or secondary domain, never the primary company domain used for transactional and marketing email. This isolates risk: if the outbound domain takes a reputation hit from aggressive sending or spam complaints, it doesn't drag down deliverability for invoices, password resets, or newsletters sent from the main domain.
A brand-new domain or mailbox has no sending history, and mailbox providers treat high-volume sending from an unknown sender as suspicious by default. The standard practice is 2 to 4 weeks of gradually increasing volume, starting low and scaling as positive engagement (opens, replies, low bounce and spam-complaint rates) accumulates. Skipping warm-up and sending at full volume immediately is one of the fastest ways to get a brand-new domain flagged before the outbound program even starts.
New mailboxes should stay under roughly 30 to 50 emails per day initially, scaling gradually as the account builds history. Beyond the initial ramp, ongoing hygiene matters just as much: keeping bounce rates under 3%, monitoring spam complaint rates, and regularly checking blocklist status all protect the sending reputation that took weeks to build.
We audit SPF, DKIM, DMARC configuration and sending practices before you scale outbound volume.
SPF, DKIM, and DMARC records all need to be correctly configured on the sending domain. Missing or misconfigured DMARC in particular has become a common cause of inbox placement problems since major mailbox providers tightened bulk sender requirements.
Most deliverability practitioners recommend 2 to 4 weeks of gradually increasing sending volume on a new domain or mailbox before running it at full cold outbound volume, starting at a low daily volume and scaling up as positive engagement signals accumulate.
Yes. Using a subdomain or a dedicated secondary domain for cold outbound protects the primary company domain's sender reputation, so a deliverability problem on the outbound domain doesn't affect transactional or marketing email sent from the main domain.
Most mailbox providers and deliverability guidance point to keeping new mailboxes under roughly 30 to 50 emails per day initially, scaling gradually as the domain and mailbox build sending history, rather than sending high volume immediately from a fresh account.
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