All leads in pending, meaning atleast one sequence has been sent from that mailbox will be left in pending.
Meaning no more emails will be sent to the lead.
We can't send follow ups from different emails.
As you can imagine to the end lead it would look very spammy.
Gmail/Outlook itself won't let us send it as a thread, some basic protocols need to follow to sit into the same thread, subject line, thread as well as ofcourse, the sender