Whether marketing emails reach the inbox instead of the spam folder.
In plain words
Deliverability depends on the sender's reputation, correct domain set-up, permission to email people and how recipients react. Sending to bought lists damages it.
Questions to ask a company that offers this
Do you email only people who agreed to hear from us?
How do you monitor deliverability?
A good company will answer these plainly and in writing. Vague or evasive answers are worth noting.
Explanation last read through on 25 October 2026. It is general guidance in plain language, not advice for your particular project. Tell us if something is wrong or unclear.