Email Deliverability
Email deliverability is the ability of an email to reach the recipient's inbox rather than the spam folder or being blocked, which depends on authentication, sender reputation, content and recipient engagement.
Also called: inbox placement, deliverability
Why it matters
Delivery and deliverability are different. A message is delivered when the receiving server accepts it; deliverability is about where it lands after that. Mailbox providers such as Gmail and Outlook decide placement using authentication (SPF, DKIM and DMARC), the reputation of the sending domain and IP, bounce and complaint rates, and how recipients have treated past mail from that sender.
For cold email, deliverability comes first, because a strong message achieves nothing in a spam folder. Teams protect it by sending from separate secondary domains, verifying addresses before sending, keeping daily volume per mailbox modest, honoring unsubscribes and writing plain, relevant messages. Google publishes sender guidelines that require bulk senders to authenticate with SPF, DKIM and DMARC and to offer one-click unsubscribe.
Example
A company starts outbound from its main domain and soon sees replies drop. A check finds a missing DKIM record and a list full of invalid addresses. The team moves outreach to a secondary domain with SPF, DKIM and DMARC set up, verifies every address before sending and lowers daily volume per mailbox. Bounces fall, and messages begin reaching inboxes again.
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