How to integrate your Mail Clients?

Integrate an SMTP server with top email clients like Apple Mail, Thunderbird, Outlook 2013 and Outlook 2007

  • Apple Mail
  • Thunderbird
  • Outlook 2013
  • Outlook 2007

Apple Mail

These instructions explain how to integrate an SMTP server to an existing Apple Mail Account.

To add SMTP settings:

Go to Mail > Preferences. On the account, you want to edit, click Outgoing Mail Server (SMTP), and select Edit SMTP Server List…

  • Click the + under the list of SMTP servers, and add a new one.
  • Enter the following details in the following screen:
    1-Server Name:
    2-Description: Netcore Email API
    3-Ports: Use default ports
    4-Encryption: Use Secure Sockets Layer (SSL)
    5-Authentication: Password
    6-User Name: Netcore Email API account username
    7-Password: Netcore Email API account password.
  • When you write an email, you can choose the outgoing server you want to use, from the dropdown below the Subject field. Once you do this selection, it is remembered and can be changed if required. This way, you can send individual messages to your regular SMTP, and the messages you need to send through Netcore Email API can go through us.


  • Unfortunately, there is not an easy way to add SMTP API headers to a message in Mail.
  • Sometimes, the way mail attaches images is not compatible with other email readers. To learn how to correct it, click here.


For sending mails through Thunderbird, you need to change the outgoing server settings in Thunderbird. You can also include an SMTP API header in your emails if you want to leverage categories or other features of the SMTP API when sending mail via the Thunderbird client. To integrate Netcore Email API with Thunderbird:

  • Go to Tools > Account Settings.
  • Enter the following:

i. Description – Netcore Email API Connection
ii. Server Name –
iii. Port – 465
iv. Connection security – SSL/TLS
v. Authentication method – Normal password
vi. User Name – your username

  • To incorporate SMTP API headers, select Tools | Options (Win) or Thunderbird | Preferences (Mac) from the menu in Thunderbird. – Open the “Advanced” category and go to the “General” tab. – Click “Config Editor“.
  • Do the following:
    1-Enter “mail.compose.other.header” under “Filter:”
    2-Double-click mail.compose.other.header.
    3-Enter “X-SMTPAPI”
    4-Click OK.
    6-5-Close the configuration editor and preferences dialog.

Restart Thunderbird for the changes to take effect.

Now, while you create a mail message, click the drop-down option that will now allow you to add a header of the type “X-SMTPAPI” in addition to “To”

  • The ‘Account Settings’ window appears.
    1-Select the account through which you receive an e-mail, and click the ‘Change’ button.
  • ‘Change Account’ window appears.
    1-Set the Outgoing Mail Server to Under Login Information, enter your Netcore Email API username and password
  • Click ‘More Settings’ button and enter the information as shown below. (Keep in mind you can also use port 25 with no security or 587 with TLS security.)

  • Under the “Outgoing Server Tab”, checkmark “My outgoing server (SMTP) requires authentication. Click “Log on using” and enter your Netcore Email API Username and Password. Click ‘OK’ and you should return to the ‘Change E-mail Account’ window.

  • Once you are back on the Change Account screen, click “Next >” to test that everything is set up correctly.
  • If all the configuration is done correctly, you should be able to see the following:
  • You have now successfully integrated your Outlook with Netcore Email API. If you need support, please contact the Netcore Email API Support team.

Outlook 2007

The instructions below guide you on how to add an SMTP server to an existing Outlook 2007 account.

Go to Tools > Account Settings. The Account Settings window should appear.

  • Select the account you receive e-mail through and click Change. TheChange E-mail Account window appears
  • Do the setting as shown in the red rectangle and then click More Settings. The Internet E-mail Settings window appears.
  • Click Outgoing Server tab and enter the Netcore Email API credentials.
  • Click the Advanced tab and enter the information. <no screenshot or detail available in
    Netcore Email API, will have to check and provide>
  • Click OK to return to the Change E-mail Account window.
  • Click Test Account Settings to verify if you are able to receive and send mail successfully.
  • You should be able to see the following. If not, then verify your settings. Click Close.

  • Click Next and then Finish to complete the setup.

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