SMTP

Enabling SMTP

  1. Tick Enable SMTP to deliver and receive emails.
  2. Select the Account Type from the drop-down menu.
  3. If Enable SMTP Authentication is ticked, you need to enter user credentials when setting up the SMTP server on mail clients other than Mail Station. For example, on Outlook Express, you need to tick My server requires authentication in Tools > Accounts > Mail Account > Properties > Servers.
    It is recommended that you enable this option to avoid being a spammer.
  4. Choose whether to enable the following options:
  5. Limit email size by specifying the Maximum size per email.
  6. Enable SMTP-SSL: Emails will be sent over SSL secure connection.
  7. Enable SMTP-TLS: Emails will be sent over TLS secure connection.

Setting up a Domain Name

Fill in the Hostname (FQDN) field. For example, if you want to set a user's email address as username@synology.com, then you need to specify the Hostname (FQDN) as synology.com.

Setting up Multiple Domain Names

You can map multiple domain names to Mail Server (e.g., synology.com, synology.com.tw, and synology.com.us) to receive emails sent to various addresses (e.g., username@synology.com, username@synology.com.tw, and username@synology.com.us).

  1. Click Additional Domain.
  2. Click the corresponding buttons to perform the desired actions.
  3. Save settings before closing the window.

Sending Emails via Other SMTP Servers

Most ISPs block or reject emails from unknown domains. If you cannot send emails directly from your own domain, you may have to send them through a well-known SMTP server. Follow the steps below to add an SMTP relay server:

  1. Click SMTP Relay.
  2. Tick Enable SMTP Relay.
  3. Specify the Server and the Port number. Enter the server with square brackets (e.g., [relay.net]) to skip redundant MX record lookup.
  4. Choose whether to enable the following options: