Send Time Optimization
01 Definition
Send Time Optimization meaning: Choosing when to send each email to raise the chance a recipient engages.
Send time optimization schedules emails for the moment each recipient is most likely to open or click, based on past activity or platform models. Many email tools offer it as an automated setting. It cannot guarantee engagement, since timing is only one factor among subject line, content, and inbox competition.
Also called
Why it matters
How Send Time Optimization fits the work
Reaching someone when they usually check email can help your message stand out near the top of the inbox instead of being buried by later arrivals.
In context
The platform learns one subscriber opens email around 7 a.m. and schedules her newsletter to arrive just before then.
Practical note
New subscribers lack enough history for reliable predictions, so the tool often falls back to a default time until it gathers activity data on them.