When you create a sequence, you must configure the sequence parameters.
One of the parameters of the sequence is the Safeguards
The Safeguards gives you the possibility to allow contacts that were previously engaged in another sequence to be added in this one.
Blue Toggle : contacts that were previously engaged in another sequence can be added in this one
Grey Toggle : contacts that were previously engaged in another sequence cannot be added to this one. They will be blocked.
Use case :
When editing your sequence, if you know that you are going to include contacts that you have already contacted in a previous sequence, we recommend you to enable this toggle (put it in blue).
However, the toggle is a protection that prevents you from sending too many sequences to your contacts. This is why we advise you to keep this safeguards enabled to prevent any spam or deliverability issues.