SPF

SPF (Sender Policy Framework) is a TXT record published in your domain’s DNS. It names the mail servers and services that are permitted to send email on the domain’s behalf: your Google Workspace or Microsoft 365 tenant, your transactional provider, your helpdesk. When a message arrives, the receiving server looks up the SPF record for the envelope sender’s domain and checks whether the connecting server is on the list.

SPF matters for cold email because a message from an unlisted server fails the check, and failed mail is filtered or refused. It also has practical limits that catch out growing teams: a record may only reference ten DNS lookups in total, and every tool you add (CRM, newsletter, invoicing) tends to add one. Exceeding the limit makes the whole record fail, taking your regular business email down with your campaigns. SPF alone also says nothing about the visible From address, which is why it is paired with DKIM and DMARC.

Seegnals sends through the mailbox you connect, so your provider’s own SPF entry covers it; there is no extra server to add. The Deliverability tab shows SPF status per sending domain, checked hourly, with unknown shown for a failed lookup rather than a false alarm.