what should be the best strategy to send high volume email from Journey for say I want to deploy 50K email daily to send 900K emails

We’ve done something similar to control large audience sends.

If your goal is ~50K per day from a total pool of ~900K, you can manage this directly in the journey using a Condition (Split) node.

What we’ve done:

1. Use the full qualified audience as the journey entry.

2. Add a Condition node.

3. In the Condition configuration, set the Method to Profile cap.

4. Set the first branch to a cap of 50,000 profiles.

5. Route the remaining audience to the next branch.

Then:

• Branch 1 --> Send email immediately

• Branch 2 --> Add a Wait (1 day) → Send email

• Branch 3 --> Add Wait (2 days) → Send email

• Continue this pattern until the full audience is distributed.

This allows you to precisely control how many profiles move down each path without relying on percentages (which can fluctuate if audience size changes). We’ve used this approach successfully for staggered sends