Definition

Deliverability is whether your emails actually land in the inbox, rather than in spam or nowhere at all. Delivered means the receiving server accepted the message; deliverability asks where it ended up.

Inbox providers decide placement using signals: the sender's reputation, whether the domain is set up correctly, how people on your list behave, and the content itself. Complaints, bounces and ignored emails push you toward spam. Deliverability is not the same as a high open rate, although poor deliverability will quietly drag open rates down. It is also not something you fix once; it is maintained by how you send every week.

A B2B example: a company imports an old trade show list and sends a big blast. Bounces and spam complaints jump, and the next newsletter to its real subscribers starts landing in spam too.

Why it matters for B2B email

Every other email effort depends on this one. A nurture sequence that lands in spam does nothing. B2B lists are small and valuable, so one careless send can hurt reach for months. Clean lists, proper domain setup and consistent sending habits keep the inbox open for the emails that matter.

Related terms

Sender reputation Sender reputation is the score inbox providers keep on your sending domain and address, based on how your past emails were received.
List hygiene List hygiene is the ongoing work of keeping your email list accurate and made of people who want to hear from you.
Double opt-in Double opt-in means a new subscriber has to confirm their email address before they are added to your list.
Open rate Open rate is the share of delivered emails that were opened.

Part of the B2B email marketing glossary. Last updated 2026-10-08.