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AWS Lambda Function to send SMTP Email
import smtplib
import os
def send_email(host, port, username, password, subject, body, mail_to, mail_from = None, reply_to = None):
if mail_from is None: mail_from = username
if reply_to is None: reply_to = mail_to
message = """From: %s\nTo: %s\nReply-To: %s\nSubject: %s\n\n%s""" % (mail_from, mail_to, reply_to, subject, body)
print (message)
server = smtplib.SMTP(host, port)
server.login(username, password)
server.sendmail(mail_from, mail_to, message)
return True
except Exception as ex:
print (ex)
return False
def lambda_handler(event, context):
# initialize variables
username = os.environ['USERNAME']
password = os.environ['PASSWORD']
host = os.environ['SMTPHOST']
port = os.environ['SMTPPORT']
mail_from = os.environ.get('MAIL_FROM')
mail_to = os.environ['MAIL_TO'] # separate multiple recipient by comma. eg: ","
origin = os.environ.get('ORIGIN')
origin_req = event['headers'].get('Host')
reply_to = event['queryStringParameters'].get('reply')
subject = event['queryStringParameters']['subject']
body = event['body']
# vaildate cors access
cors = ''
if not origin:
cors = '*'
elif origin_req in [o.strip() for o in origin.split(',')]:
cors = origin_req
# send mail
success = False
if cors:
success = send_email(host, port, username, password, subject, body, mail_to, mail_from, reply_to)
# prepare response
response = {
"isBase64Encoded": False,
"headers": { "Access-Control-Allow-Origin": cors }
if success:
response["statusCode"] = 200
response["body"] = '{"status":true}'
elif not cors:
response["statusCode"] = 403
response["body"] = '{"status":false}'
response["statusCode"] = 400
response["body"] = '{"status":false}'
return response

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rambabusaravanan commented Aug 5, 2017

Environment Variables

PASSWORD: { app-specific-password }
MAIL_FROM: Alias Name <> (Optional)
MAIL_TO: Recipient1 <>, Recipient2 <>
ORIGIN:, (Optional)

Query Params

subject="System Notice"
reply="" (Optional)

Request Body

[ Email Text Message ]

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rambabusaravanan commented Aug 15, 2017

Replace the string 'Host' with 'origin' at line number 32


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ashishhavells commented Apr 16, 2018

Hi you may use below codes for creating multiple backups in a day with instance name:

import boto3
import collections
import datetime
import sys
import pprint

ec = boto3.client('ec2')
#image = ec.Image('id')

def lambda_handler(event, context):

reservations = ec.describe_instances(
        {'Name': 'tag-key', 'Values': ['odd', 'Odd']},
    'Reservations', []
print "Hello",
for h in reservations:
    print h
instances = sum(
        [i for i in r['Instances']]
        for r in reservations
    ], [])

print "Found %d instances that need backing up" % len(instances)

to_tag = collections.defaultdict(list)

for instance in instances:
        retention_days = [
            int(t.get('Value')) for t in instance['Tags']
            if t['Key'] == 'Retention'][0]
    except IndexError:
        retention_days = 7

    #for dev in instance['BlockDeviceMappings']:
    #    if dev.get('Ebs', None) is None:
    #        continue
    #    vol_id = dev['Ebs']['VolumeId']
    #    print "Found EBS volume %s on instance %s" % (
    #        vol_id, instance['InstanceId'])

        #snap = ec.create_snapshot(
        #    VolumeId=vol_id,
        #create_image(instance_id, name, description=None, no_reboot=False, block_device_mapping=None, dry_run=False)
        # DryRun, InstanceId, Name, Description, NoReboot, BlockDeviceMappings
        create_time =
        create_fmt = create_time.strftime('%H-%M-%S--%Y-%m-%d')
        #Variables for storing ec2 Instance Name and ec2 Instance ID
        ec2_Instance_Name = ''
        ec2_Instance_ID = ''
        ec2_Instance_ID = instance['InstanceId']
        ec2_Instance_Name = get_instance_name(ec2_Instance_ID)
        AMIid = ec.create_image(InstanceId=instance['InstanceId'], Name="Lambda - " + instance['InstanceId'] + " " + ec2_Instance_Name + " (Odd) from " + create_fmt, Description="Lambda created AMI of instance " + instance['InstanceId'] + " from " + create_fmt, NoReboot=True, DryRun=False)

        print "Retaining AMI %s of instance %s for %d days" % (

print to_tag.keys()

for retention_days in to_tag.keys():
    delete_date = + datetime.timedelta(days=retention_days)
    delete_fmt = delete_date.strftime('%m-%d-%Y')
    print "Will delete %d AMIs on %s" % (len(to_tag[retention_days]), delete_fmt)

            {'Key': 'DeleteOn', 'Value': delete_fmt},

Function to get Instance Name

def get_instance_name(fid):
# When given an instance ID as str e.g. 'i-1234567', return the instance 'Name' from the name tag.
ec2 = boto3.resource('ec2')
ec2instance = ec2.Instance(fid)
instancename = ''
for tags in ec2instance.tags:
if tags["Key"] == 'Name':
instancename = tags["Value"]
return instancename


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ashishhavells commented Apr 16, 2018

can anyone help me to generate summary in mail for daily backup detail.
AMI Name and Backup Status.


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rambabusaravanan commented Aug 22, 2018

Good one to note 🎉 👍

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