Suppose you have a set of emails scheduled from a particular email address. In that case, you can "swap the email address" to send them from a different email address - without disturbing your cadences.
To swap the email account, head to Settings > Emails > Email Account > Disconnect.
On hitting "Disconnect" - you will find the option "Swap Email Account".
Now, provide the email address with which you'd like to reschedule the emails.
Finally, hit "Connect" to complete swapping the email accounts.