Send time optimizer
Choose a practical send window before you test.
Pick a starting send window by audience, industry, campaign type, and recipient timezone. Treat it as a controlled test, not a promise of opens.
Timing preflight
Start with a clear test window.
Folderly keeps timing guidance simple: avoid noisy inbox windows, segment by region, then validate with real campaign data.
3
send windows
4
inputs
0
guarantees
Direct answer
The best time to send an email is the first controlled test window for a specific audience, not a universal hour. For B2B cold outreach, start with mid-week business hours in the recipient's local timezone, segment by region, and judge results with replies, bounces, unsubscribes, and inbox placement.
Definition
A send time optimizer is a planning tool that selects practical email send windows from audience, industry, campaign type, and timezone inputs.
Best for
- - Choosing a first timing test before launching or scaling a campaign.
- - Segmenting sends by recipient timezone and audience type.
- - Teams that want timing guidance tied to deliverability and reply quality.
Not best for
- - Guaranteeing opens, replies, or inbox placement from timing alone.
- - Fixing weak offers, poor lists, risky copy, or sender reputation issues.
- - Sending one global campaign time to mixed-region audiences.
Example
Input: B2B SaaS cold outreach to Eastern Time decision makers with a first-touch campaign.
Output: Start with a Tuesday or Wednesday morning test window, then compare replies, bounces, and complaints before changing the message.
Limitations
- - Timing tests are directional and must be read with audience quality and deliverability signals.
- - Historical campaign data is stronger than generic benchmarks once enough sends exist.
Useful next sources
Campaign timing
Use the closest match for the audience you are sending to. Run one test window at a time.
Recommended window
Tuesday at 10:00 AM
Time shown in Eastern Time. Use it as your first controlled timing test.
This index is a planning signal for comparing windows in this tool, not a forecasted open rate.
1. Tuesday at 10:00 AM
Use this as the primary test window.
2. Wednesday at 9:00 AM
Use this as the primary test window.
3. Thursday at 2:00 PM
Keep this as a backup test window.
How to use it
Timing helps only after the message is ready.
A cleaner send window can reduce noise, but deliverability still depends on authentication, list quality, sender reputation, and a message people understand quickly.
Current timing notes
Is this a guarantee?
No. It gives a practical first testing window. Your list quality, offer, subject line, and sender reputation still drive results.
Which timezone should I use?
Use the recipient's local timezone whenever possible. If the list spans regions, segment the send by region instead of using one global time.
What should I test next?
Run one timing test at a time, then review inbox placement, replies, unsubscribes, and bounce behavior before changing the message.