GUI tkinter application freezes while sending multiple emails

Question

Am new to stack overflow, so if i do something wrong please don't rude like any other social code webpage, explain. So am coding a program that sends multi emails to one receiver as a email bomber, not to do any harm it was a old project for an assignment. when i enter the info no problem but as soon as I click send the program is non responsive until it send all emails, so well it send the GUI is freezon, once the task done it un freeze how can a fix that please.

from tkinter import *
import smtplib
from tkinter import messagebox
from tkinter.ttk import Progressbar
 
root = Tk()
root.title("Email Bomber V1.0")
root.iconbitmap("icon.ico")
root.resizable(width=FALSE, height=FALSE)
frame_title = LabelFrame(root, padx=5, pady=7)
frame_title.grid(padx=10, pady=10, row=0, column=1, sticky=W)
title = Label(frame_title, text="Email Bomber V1.0 - De Eklectik Design")
title.grid(row=0, column=2)
 
# Email text
email_info = Label(root, text="Adresse Mail:")
email_info.grid(row=1, column=0, sticky=W)
# Email text box
email_input = Entry(root, borderwidth=2, width=50, )
email_input.grid(row=1, column=1, pady=2, padx=5)
email_input.get()
 
# Password text
password_info = Label(root, text="Mot de passe:")
password_info.grid(row=2, column=0, sticky=W)
# Password text box
password_input = Entry(root, borderwidth=2, width=50, show='*')
password_input.grid(row=2, column=1, pady=2, padx=5)
password_input.get()
 
# Number of email sent
amount_info = Label(root, text="Numbre(s) de Bomb mail:")
amount_info.grid(row=3, column=0, sticky=W)
# Amount text box
amount = Entry(root, borderwidth=2, width=50)
amount.grid(row=3, column=1, pady=2, padx=5)
amount.get()
 
# Email of receiver
email_receiver_info = Label(root, text="Adresse Mail du victim:", )
email_receiver_info.grid(row=4, column=0, sticky=W)
# Password text box
email_receiver_input = Entry(root, borderwidth=2, width=50)
email_receiver_input.grid(row=4, column=1, pady=2, padx=5)
email_receiver_input.get()
 
# Message
message = Label(root, text="Message:\n\n<Ne pas suppimer 'Subject'>\n<indiquer suject puis>\n<a la ligne pour message>")
message.grid(row=5, column=0, sticky=W)
 
message_box = Text(root, borderwidth=2, width=38, height=10)
message_box.insert(1.0, "Subject: ")
 
message_box.grid(row=5, column=1, pady=2, padx=5)
message_box.get(1.0, END)
 
 
def send_email():
 
    bar = Progressbar(root, orient=VERTICAL, length=100, mode='determinate')
    bar.grid(row=4, column=3)
    count = 0
    # Download speed
    speed_string = amount.get()
    speed_float = float(speed_string)
    speed_round = round(speed_float, 2)
    speed = 100 / speed_round + 1
 
    while not count == int(amount.get()):
 
        try:
            server = smtplib.SMTP_SSL("smtp.gmail.com", 465)
            server.login(email_input.get(), password_input.get())
            server.sendmail('yoan', email_receiver_input.get(), message_box.get(1.0, END))
            server.quit()
            count += 1
            while count < int(amount.get()):
                bar['value'] += speed  # change with problem equation
                root.update_idletasks()
                break
            else:
                messagebox.showinfo("Message", f'{count} Mail(s) Envoyer.')
 
        except Exception as e:
            messagebox.showinfo("Error Email not send", f'{e} - Error Mail non envoyer.')
            break
 
 
send = Button(root, text="Envoyer", command=send_email, width=10)
send.grid(row=6, column=0, sticky=W, pady=2, padx=4)
button_quit = Button(root, text="Quiter", command=root.quit)
button_quit.grid(row=6, column=1, sticky=W)
 
root.mainloop()