How to continuously monitor a new mail in outlook

I want to check for a particular sender email and process it automatically wherever it arrives

However, there may be some situation where my outlook was restarted, mean while i received mail from sender and marked as unread

For continuous monitor for a new mail for a specific subject i have found the following code

import win32com.client
import pythoncom
import re

class Handler_Class(object):
  def OnNewMailEx(self, receivedItemsIDs):
    # RecrivedItemIDs is a collection of mail IDs separated by a ",".
    # You know, sometimes more than 1 mail is received at the same moment.
    for ID in receivedItemsIDs.split(","):
        mail = outlook.Session.GetItemFromID(ID)
        subject = mail.Subject
    print subject   
        try: 
            command = re.search(r"%(.*?)%", subject).group(1)

            print command # Or whatever code you wish to execute.
        except:
            pass


outlook = win32com.client.DispatchWithEvents("Outlook.Application",Handler_Class)

#and then an infinit loop that waits from events.
pythoncom.PumpMessages()

Even i want to go through all the unread mails to check whether a mail from a sender has came and process it( if found)

Is there any function to check for unread mails to add within handler_class

Or let me know for any alternate procedure

So if you restart your python script every time your Outlook restart, then add these lines to your code to check unread emails in your Inbox:

ol = win32com.client.Dispatch( "Outlook.Application")
inbox = ol.GetNamespace("MAPI").GetDefaultFolder(6)
for message in inbox.Items:
    if message.UnRead == True:
        print message.Subject #or whatever command you want to do

Put this code before your definition of outlook in your code

EDIT

For me, the code you posted works great until I close Outlook and then even if I reopen it, I don't get anything when a new message is received (see one of my comments). I guess the fact of closing Outlook "unlink" with pythoncom.PumpMessages(). Anyway, I come around to do both your checking for unread email in the class Handler_Class and restart the monitoring in case you restart Outlook.

import win32com.client
import ctypes # for the VM_QUIT to stop PumpMessage()
import pythoncom
import re
import time
import psutil

class Handler_Class(object):

    def __init__(self):
        # First action to do when using the class in the DispatchWithEvents     
        inbox = self.Application.GetNamespace("MAPI").GetDefaultFolder(6)
        messages = inbox.Items
        # Check for unread emails when starting the event
        for message in messages:
            if message.UnRead:
                print message.Subject # Or whatever code you wish to execute.

    def OnQuit(self):
        # To stop PumpMessages() when Outlook Quit
        # Note: Not sure it works when disconnecting!!
        ctypes.windll.user32.PostQuitMessage(0)

    def OnNewMailEx(self, receivedItemsIDs):
    # RecrivedItemIDs is a collection of mail IDs separated by a ",".
    # You know, sometimes more than 1 mail is received at the same moment.
        for ID in receivedItemsIDs.split(","):
            mail = self.Session.GetItemFromID(ID)
            subject = mail.Subject
            print subject   
            try: 
                command = re.search(r"%(.*?)%", subject).group(1)
                print command # Or whatever code you wish to execute.
            except:
                pass

# Function to check if outlook is open
def check_outlook_open ():
    list_process = []
    for pid in psutil.pids():
        p = psutil.Process(pid)
        # Append to the list of process
        list_process.append(p.name())
    # If outlook open then return True
    if 'OUTLOOK.EXE' in list_process:
        return True
    else:
        return False

# Loop 
while True:
    try:
        outlook_open = check_outlook_open()
    except: 
        outlook_open = False
    # If outlook opened then it will start the DispatchWithEvents
    if outlook_open == True:
        outlook = win32com.client.DispatchWithEvents("Outlook.Application", Handler_Class)
        pythoncom.PumpMessages()
    # To not check all the time (should increase 10 depending on your needs)
    time.sleep(10)

Not sure it is the best way, but it seems to work the way you look for.