This panel lets you throttle the sending of email campaigns.

Sending and Chunk Size

Here you can choose how to send the emails of an email campaign. This is important if you are going to send, say 10 000 emails and your email provide has rate limits like "no more than 100 emails per 5 minutes".

• Immediate will send a chunk of 50 (or whatever you configure in the Chunk Size field) emails immediately and then wait for you to press the "Next" button.
• Asynchronous will create a scheduled task that will send a chunk of emails and then schedule a new task for the next chunk, etc. Additional settings for the schedule task can be found here: Send a chunk of emails for the campaign "email campaign name".

Maximum emails to same domain

For each chunk, you can specify the maximum number of emails that can be sent to a single recipient domain, usually to avoid being blacklisted.

Delay between chunks

You can set the time interval between attempts to send each chunk of remaining emails.

Delay in case of maximum number of emails reached

Specify the time interval between server attempts to send the remaining emails in cases when all remaining recipients have already reached their maximum number of emails for the day.