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Once Send Time Optimization (STO) is enabled for your account, it will appear on the Scheduling page of the eligible email campaigns, and in the Send email node of Automation Center programs.
You turn STO on and off via the toggle switch, and can use it for campaigns launched immediately or those schedule for a later date.
As Send Time Optimization needs past contact behavior data to determine the optimal sending times, we do not recommend using STO until you have at least 1 month of email campaign history. If you turn STO on too early, it will distribute contacts randomly among the child launches and this can actually result in a decline in responses.
Once you feel you have enough launched email campaigns, you should start to use STO for all your ad hoc batch campaigns. It will take a number of campaigns before STO has learned enough about the response habits of your customers. Until then, response rates will vary and may even appear to decline. You will be notified on the Send Time Optimization Dashboard widget when the model has become stable enough for the reporting to be statistically relevant.
For more information, read the Send Time Optimization - FAQ.
Currently, STO does not support campaigns that use relational segments and personalization with relational data at the same time. In such cases, do not enable STO as contacts may be excluded from the launches.
Launching an email campaign with STO
When your email campaign is ready to launch, activate Send Time Optimization on the default Scheduling or Advanced Scheduling page. You then have two options:
- Launch now - Emarsys will immediately create a control group comprising 10% of the launch list, and then calculate the optimal sending times for the remaining contacts. Once the calculations are finished, the campaign will be launched to the control group and the first STO launch will take place on the next even hour. The remaining contacts will be divided into 11 further launches every two hours.
- Launch at - Emarsys will launch the campaign to the control group at the time you specify in the scheduling. The 12 STO launches will be spread evenly throughout that calendar day and will start at 00:00 am in the timezone defined for that campaign.
This feature can currently only be enabled for ad hoc email campaigns.
- The earliest available option offered in the date picker is the following day; you cannot schedule a launch for later in the current day.
- If you activated the BCC option in the Email Settings step, only the first STO launch will be BCC'd to the email addresses you selected.
Advanced vs simple scheduling
There are some difference in behavior for STO depending on whether you are using simple or advanced scheduling.
When using Advanced Scheduling:
- If you are using A/B testing, STO will only be enabled for the final mailing. All the versions you use to test will be launched as normal emails.
- It is not currently possible to abort the STO launches. You can, however, unschedule a scheduled launch when there are at least 30 minutes left until the launch.
- The launches are started on the scheduled day at the time when the campaign was launched, not at 00:00. Therefore the launches will be spread over two calendar days.
Using STO in the Automation Center
You can also enable STO for batch email nodes in any program that does not start with a transactional entry node (i.e. not External Event, Form, Data Change, New Contact).
The behavior is the same as for ad hoc batch emails:
- A 10% control group is automatically created and launched as soon as the email is triggered.
- The remaining 90% of contacts will be split up in 12 launches over the following 24 hours.
- The responses will show up on the STO widget.
Additionally, the following behavior should be noted:
- Pausing a program will not stop STO emails that are already scheduled for launch.
- Aborting a program will stop all current and scheduled STO launches. If you need to know which contacts are affected, you will have to contact Emarsys Support.
- Launches smaller than 100 contacts will not be counted on the STO widget (as there will be no control group).
- When an AC program sends out a campaign using STO, the next node will only be processed when all mail has been sent out, which means that an STO node will always take 24 hours to process.
Currently, STO does not support campaigns that use relational segments and personalization with relational data at the same time. In such cases, do not enable STO in the Send email nodes as contacts may be excluded from the launches.
STO needs to calculate the launch time for every contact in your launch list. When sending your first campaign, you should allow at least two hours for the initial calculations.
For subsequent campaigns, the time it takes for STO to calculate the best sending times may range from a few minutes to two hours. The actual calculation time depends on the size of your database as well as the complexity of the contact segment and the launch list.
Monitoring the performance of STO campaigns
On the Dashboard
The Send Time Optimization widget on the account Dashboard compares the response rates of STO campaigns against those of their control groups.
On the Email Analysis page
In the campaign breakdown list, campaigns which have not yet been launched will be listed with random launch times. For exact launch times, check back once the entire STO campaign has been sent out.
The launch times you see here are in the timezone defined for the campaign, which may not be the same as the timezone defined in your My Profile page.