Email Campaign Timing

Definition

Email campaign timing refers to the strategic determination of when to send email messages to maximise engagement, conversion, and deliverability outcomes. Timing decisions encompass multiple dimensions including day of week, time of day, day of month, seasonal timing relative to business cycles, and timing relative to subscriber events and behaviours. The complexity of timing optimisation arises from the interaction between sender objectives, subscriber preferences and habits, competitive send timing, and mailbox provider processing patterns.

Optimal send time varies significantly by audience, industry, and campaign type. B2B programmes typically perform best on Tuesday through Thursday during business hours, with peak engagement between 10:00 AM and 2:00 PM in the recipient's time zone. B2C e-commerce campaigns often see strong performance on Sunday evenings and Tuesday mornings, with optimal times varying by vertical and audience demographics. Content-focused newsletters may benefit from consistent scheduling that builds reader habits, such as daily, weekly, or monthly fixed send times. These general patterns provide starting points, but the only reliable way to determine optimal timing for a specific programme is through systematic testing. Send time personalisation extends this further by calculating optimal times for individual subscribers based on their historical engagement patterns, enabling each subscriber to receive messages when they are most likely to engage.

Best Practices

Implement send time testing using a structured methodology that tests different days of the week first (establishing the best day), then times of day (within the best day), and finally refines timing through sequential tests. Running multiple timing tests simultaneously can produce misleading results due to interaction effects.

Use recipient time zone sending to deliver messages at the appropriate local time for each subscriber rather than sending from a single time zone. This approach typically improves engagement rates by 5-15 per cent compared to single-time-zone sending for programmes with geographically distributed audiences.

Establish time-based campaign triggers for events with natural timing constraints such as flash sales, event reminders, restock notifications, and countdown campaigns. These triggers should include appropriate lead time and reminder schedules calibrated to the urgency and complexity of the desired action.

Document campaign timing decisions and their performance impact to build an organisational knowledge base about timing effectiveness. Include seasonality patterns, holiday effects, and industry events that affect engagement timing in different periods.

Monitor timing performance continuously as subscriber behaviour patterns evolve. The optimal send time for a programme can shift due to changing subscriber demographics, work patterns, device usage, or competitive send timing.