Python function calling repeated for each element in list

Hi i am trying to pass a list to my SendMail function and i am getting values like this for list['abc','cde','ijk']output abc abc,cde abc,cde,ijk.I need my function to run once and give me the final list only which is list['abc','cde','ijk']. The original list is a collection of unmatched files names. here is my code please help me. And i am receiving email for each output i need one email

##Packages used
import os
import re
import sys
import glob
import pandas as pd

##Send mail function using unix sendmail
def sendMail(msg):
    a=''
    for i in msg:
        a+="%s
" %i
    sendmail_location = "/usr/sbin/sendmail" # sendmail location
    p = os.popen("%s -t" % sendmail_location, "w")
    p.write("From: %s
" % "abc@123.com")
    p.write("To: %s
" % "abc@123.com")
    p.write("Subject: File Name  Error
")
    p.write("
") # blank line separating headers from body
    p.write("
"+a)
    print("
"+a)
    status = p.close()
    if status != 0:
           print("Sendmail exit status", status)
match=[]
not_match=[]
try:
    for file in glob.glob('*.csv'):
        r = re.search(r'sales_abc_(20[0-9][0-9])-([1-9]|1[0-2]|0[0-9])-([1-9]|1[0-9]|2[0-9]|3[0-1]|0[0-9])-[0-9]{2}_[a-z0-9]{3,5}.csv', file)
        if r:
            match.append(file)
        if not r:
            not_match.append(file)
            sendMail(not_match)
except Exception:
    not_found="File Not Found"
    sendMail(not_found)