diff --git a/USER_GUIDE.md b/USER_GUIDE.md
index aead95e..9557ce0 100644
--- a/USER_GUIDE.md
+++ b/USER_GUIDE.md
@@ -28,6 +28,7 @@ Option | Default Value | Valid Options |  Environment Variable | Description
 -n, --filename | opensearch-report-timestamp | - | OPENSEARCH_FILENAME | file name of the report
 -a, --auth | none | basic, saml, cognito | - | authentication type for the report
 -t, --tenant | private | - | - | tenants in opensearch dashboards
+--multitenancy | true | true, false | - | enable or disable multi-tenancy
 -c, --credentials | - | - | OPENSEARCH_USERNAME and OPENSEARCH_PASSWORD | login credentials in the format of username:password for connecting to url
 -s, --from | - | - | OPENSEARCH_FROM | email address of the sender
 -r, --to | - | - | OPENSEARCH_TO | email address of the recipient
@@ -39,6 +40,7 @@ Option | Default Value | Valid Options |  Environment Variable | Description
 --smtpsecure | - | - | OPENSEARCH_SMTP_SECURE | if true the connection will use TLS when connecting to server.
 --subject | This is an email containing your dashboard report | - | OPENSEARCH_SUBJECT | subject for the email
 --note | Hi,\nHere is the latest report! | string or path to text file | OPENSEARCH_EMAIL_NOTE | The email body
+--selfsignedcerts | false | true, false | - | enable or disable self-signed certicates for smtp transport
 | - | - | - | CHROMIUM_PATH | path to chromium directory
 
 You can also find this information using help command.
diff --git a/src/arguments.js b/src/arguments.js
index 5630e5e..49ea7c0 100644
--- a/src/arguments.js
+++ b/src/arguments.js
@@ -8,7 +8,7 @@ const { program, Option } = require('commander');
 const { exit } = require('process');
 const fs = require('fs');
 const ora = require('ora');
-const { AUTH, CLI_COMMAND_NAME, DEFAULT_AUTH, DEFAULT_FILENAME, DEFAULT_FORMAT, DEFAULT_MIN_HEIGHT, DEFAULT_TENANT, DEFAULT_WIDTH, ENV_VAR, FORMAT, TRANSPORT_TYPE, DEFAULT_EMAIL_SUBJECT, DEFAULT_EMAIL_NOTE, DEFAULT_MULTI_TENANCY } = require('./constants.js');
+const { AUTH, CLI_COMMAND_NAME, DEFAULT_AUTH, DEFAULT_FILENAME, DEFAULT_FORMAT, DEFAULT_MIN_HEIGHT, DEFAULT_TENANT, DEFAULT_WIDTH, ENV_VAR, FORMAT, TRANSPORT_TYPE, DEFAULT_EMAIL_SUBJECT, DEFAULT_EMAIL_NOTE, DEFAULT_MULTI_TENANCY, DEFAULT_SELF_SIGNED_CERTIFICATES } = require('./constants.js');
 const dotenv = require("dotenv");
 dotenv.config();
 const spinner = ora('');
@@ -30,8 +30,8 @@ async function getCommandArguments() {
         .addOption(new Option('-t, --tenant <tenant>', 'tenants in opensearch dashboards')
             .default(DEFAULT_TENANT))
         .addOption(new Option('--multitenancy <flag>', 'enable or disable multi-tenancy')
-                .default(DEFAULT_MULTI_TENANCY)
-                .choices(['true', 'false']))
+            .default(DEFAULT_MULTI_TENANCY)
+            .choices(['true', 'false']))
         .addOption(new Option('-f, --format <type>', 'file format for the report')
             .default(DEFAULT_FORMAT)
             .choices([FORMAT.PDF, FORMAT.PNG, FORMAT.CSV]))
@@ -65,6 +65,9 @@ async function getCommandArguments() {
         .addOption(new Option('--note <note>', 'email body (string or path to text file)')
             .default(DEFAULT_EMAIL_NOTE)
             .env(ENV_VAR.EMAIL_NOTE))
+        .addOption(new Option('--selfsignedcerts <flag>', 'enable or disable self-signed certicates for smtp transport')
+            .default(DEFAULT_SELF_SIGNED_CERTIFICATES)
+            .choices(['true', 'false']));
 
     program.addHelpText('after', `
 Note: The tenant in the url has the higher priority than tenant value provided as command option.`);
@@ -94,6 +97,8 @@ async function getEventArguments(event) {
         event['note'] = DEFAULT_EMAIL_NOTE;
     if (event.multitenancy === undefined)
         event['multitenancy'] = DEFAULT_MULTI_TENANCY;
+    if (event.selfsignedcerts === undefined)
+        event['selfsignedcerts'] = DEFAULT_SELF_SIGNED_CERTIFICATES;
 
     return getOptions(event);
 }
@@ -121,7 +126,8 @@ function getOptions(options) {
         subject: null,
         time: null,
         note: null,
-        emailbody: null
+        emailbody: null,
+        selfsignedcerts: null
     }
 
     // Set url.
@@ -213,6 +219,9 @@ function getOptions(options) {
     }
     commandOptions.note = getHtml(commandOptions.note);
 
+    // Set self signed certificate flag.
+    commandOptions.selfsignedcerts = options.selfsignedcerts;
+
     spinner.succeed('Fetched argument values');
     return commandOptions;
 }
diff --git a/src/constants.js b/src/constants.js
index 37a44b9..c427678 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -13,6 +13,7 @@ const DEFAULT_FILENAME = 'opensearch-report';
 const DEFAULT_EMAIL_SUBJECT = 'This is an email containing your opensearch dashboard report';
 const DEFAULT_EMAIL_NOTE = 'Hi,\nHere is the latest report!';
 const DEFAULT_MULTI_TENANCY = true;
+const DEFAULT_SELF_SIGNED_CERTIFICATES = false;
 
 const REPORT_TYPE = {
   DASHBOARD: 'Dashboard',
@@ -73,5 +74,5 @@ const TRANSPORT_TYPE = {
 
 module.exports = {
   CLI_COMMAND_NAME, DEFAULT_AUTH, DEFAULT_TENANT, DEFAULT_FORMAT, DEFAULT_WIDTH, DEFAULT_MIN_HEIGHT, DEFAULT_FILENAME, DEFAULT_EMAIL_SUBJECT,
-  DEFAULT_EMAIL_NOTE, REPORT_TYPE, SELECTOR, FORMAT, AUTH, URL_SOURCE, ENV_VAR, TRANSPORT_TYPE, DEFAULT_MULTI_TENANCY
+  DEFAULT_EMAIL_NOTE, REPORT_TYPE, SELECTOR, FORMAT, AUTH, URL_SOURCE, ENV_VAR, TRANSPORT_TYPE, DEFAULT_MULTI_TENANCY, DEFAULT_SELF_SIGNED_CERTIFICATES
 };
\ No newline at end of file
diff --git a/src/email-helpers.js b/src/email-helpers.js
index b3e631e..05b80cf 100644
--- a/src/email-helpers.js
+++ b/src/email-helpers.js
@@ -20,7 +20,7 @@ try {
   // Do not set AWS_SDK_LOAD_CONFIG if aws config file is missing.
 }
 
-module.exports = async function sendEmail(filename, url, sender, recipient, transport, smtphost, smtpport, smtpsecure, smtpusername, smtppassword, subject, note, emailbody) {
+module.exports = async function sendEmail(filename, url, sender, recipient, transport, smtphost, smtpport, smtpsecure, smtpusername, smtppassword, subject, note, emailbody, selfsignedcerts) {
   if (transport !== undefined && (transport === 'smtp' || ses !== undefined) && sender !== undefined && recipient !== undefined) {
     spinner.start('Sending email...');
   } else {
@@ -41,7 +41,7 @@ module.exports = async function sendEmail(filename, url, sender, recipient, tran
 
   let mailOptions = getmailOptions(url, sender, recipient, filename, subject, note, emailbody);
 
-  let transporter = getTransporter(transport, smtphost, smtpport, smtpsecure, smtpusername, smtppassword);
+  let transporter = getTransporter(transport, smtphost, smtpport, smtpsecure, smtpusername, smtppassword, selfsignedcerts);
 
   transporter.use("compile", hbs({
     viewEngine: {
@@ -54,21 +54,22 @@ module.exports = async function sendEmail(filename, url, sender, recipient, tran
 
   // send email
   return new Promise((success, fail) => {
-      transporter.sendMail(mailOptions, function (err, info) {
-        if (err) {
-          spinner.fail('Error sending email' + err);
-          fail(err);
-          exit(1);
-        } else {
-          spinner.succeed('Email sent successfully');
-          deleteTemporaryImage(emailbody);
-          success(info);
-        }
-      });
+    transporter.sendMail(mailOptions, function (err, info) {
+      if (err) {
+        spinner.fail('Error sending email' + err);
+        fail(err);
+        exit(1);
+      } else {
+        spinner.succeed('Email sent successfully');
+        deleteTemporaryImage(emailbody);
+        success(info);
+      }
     });
+  });
 }
 
-const getTransporter = (transport, smtphost, smtpport, smtpsecure, smtpusername, smtppassword, transporter) => {
+const getTransporter = (transport, smtphost, smtpport, smtpsecure, smtpusername, smtppassword, selfsignedcerts, transporter) => {
+  var rejectSelfSignedCerts = selfsignedcerts === 'true' ? false : true;
   if (transport === 'ses') {
     transporter = nodemailer.createTransport({
       SES: ses
@@ -81,7 +82,10 @@ const getTransporter = (transport, smtphost, smtpport, smtpsecure, smtpusername,
       auth: {
         user: smtpusername,
         pass: smtppassword,
-      }
+      },
+      tls: {
+        rejectUnauthorized: rejectSelfSignedCerts,
+      },
     });
   }
   return transporter;
diff --git a/src/run.js b/src/run.js
index e6a9c65..e6dc78c 100755
--- a/src/run.js
+++ b/src/run.js
@@ -43,6 +43,7 @@ module.exports = async function run(args) {
         options.smtppassword,
         options.subject,
         options.note,
-        options.emailbody
+        options.emailbody,
+        options.selfsignedcerts
     );
 }
diff --git a/test/help.test.js b/test/help.test.js
index a7002e2..419cae7 100644
--- a/test/help.test.js
+++ b/test/help.test.js
@@ -33,6 +33,7 @@ Options:
   --smtppassword <password>              smtp password (env: OPENSEARCH_SMTP_PASSWORD)
   --subject <subject>                    email subject (default: "This is an email containing your opensearch dashboard report", env: OPENSEARCH_EMAIL_SUBJECT)
   --note <note>                          email body (string or path to text file) (default: "Hi,\\nHere is the latest report!", env: OPENSEARCH_EMAIL_NOTE)
+  --selfsignedcerts <flag>               enable or disable self-signed certicates for smtp transport (choices: "true", "false", default: false)
   -h, --help                             display help for command
 
 Note: The tenant in the url has the higher priority than tenant value provided as command option.