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 > Email settings > 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 and hit the swap email account button,

After successful completion of swapping, now you have to connect the swapped mail id with Klenty account. Afterwhich, you can log in with Gmail/Outlook/SMTP/IMAP.

Please note that the Swap option will not be reflected if there are no scheduled emails connected with your Klenty account.