Read Emulation is an advanced warmup feature that mimics reading warm-up emails like a real human. It sends signals to ESPs (the email provider) that your messages are relevant as they will be "read" by the email receiver which has a positive impact on the deliverability and reputation of your domains.

A: We suggest that you always enable the Read Emulation feature unless you have been instructed otherwise.

Also, the reason we gave an option to enable/disable this feature is because there are certain third-party SMTP providers who have their own tracking analytics system.

In order to keep track of it, these providers insert a tracking pixel. That tracking pixel gets triggered when the Read Emulation feature is enabled and treats the email as a real email.

So, for SMTP providers who don't want warmup emails to affect their tracking analytics, we gave them the option to disable the Read Emulation feature.