gistfile1.py

import socket
import smtplib
import datetime

REMOTE_SMTP_HOST = "smtp.example.com"
REMOTE_SMTP_LOGIN = "postman@example.com"
REMOTE_SMTP_PASSWORD = "postman_password"

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(0.2)

try:
    sock.connect(("127.0.0.1",25))
    print "Port is open"
except:
   s = smtplib.SMTP()
   s.connect(REMOTE_SMTP_HOST, 25)
   s.login(REMOTE_SMTP_LOGIN, REMOTE_SMTP_PASSWORD)

   fromaddr = "smtp-relay@example.com"
   toaddrs = ["dev1@example.com",  "dev2@example.com"]
   subj = "Salesforce SMTP Relay is down"
   text = "Salesforce SMTP Relay is down"
   msg = "From: %s\nTo: %s\nSubject: %s\nDate: %s\n\n%s" % (fromaddr, ", ".join(toaddrs), subj, datetime.datetime.now().strftime( "%d/%m/%Y %H:%M" ), text)

   s.sendmail(fromaddr, toaddrs, msg)