Domain

You can manage multiple domains and configure settings related to alias, auto BCC, usage limit, and disclaimer in Synology MailPlus Server.

To add a domain:

  1. Click Add.
  2. Enter the following information and click Next:
  3. Select members to add to this domain and click Next.
  4. Confirm the email addresses of the selected members.

Note:

To edit domains:

  1. Select the target domain and click Edit.
  2. Go to the General tab to adjust the following settings:
  3. Save the settings.

To enable DKIM signing:

  1. Select the target domain and click Edit.
  2. Click Advanced.
  3. Tick Enable DKIM signing on outbound emails.
  4. Enter a DKIM selector prefix as you please. A DKIM selector is a name used for the identification of the DKIM public key.
  5. Click Generate Public Key.
  6. Select the DKIM key length. The default is 2048 bits. Note that 2048-bit keys may exceed the limit set by your domain host. If the DKIM key gets rejected, change the key length to 1024 or 512 bits.
  7. Click OK to save the settings.
  8. Add and update the public key to your DNS records using a TXT record, so that other mail servers will be able to authenticate your DKIM signature.

Note:

To enable catch-all:

  1. Select the target domain and click Edit.
  2. Click Advanced.
  3. Tick Enable catch-all to receive emails that are sent to an address that does not exist or is not enabled in the domain.
  4. Select a user account to serve as the catch-all mailbox.

To add users to a domain:

  1. Select a domain and click Edit.
  2. Go to the User tab and click Add.
  3. Select the target users and click Next.
  4. Confirm the email addresses of the selected users.

To edit user settings in a domain:

  1. Select a domain and click Edit.
  2. Go to the User tab, select the target user, and click Edit.
  3. In the Edit User window, adjust the following settings:

Note:

To remove users from a domain:

  1. Select a domain and click Edit.
  2. Go to the User tab, select the target users, and click Delete.

To add groups to a domain:

  1. Select a domain and click Edit.
  2. Go to the Group tab and click Add.
  3. Select the target groups and click Next.
  4. Confirm the email addresses of the members.

To edit group settings in a domain:

  1. Select a domain and click Edit.
  2. Go to the Group tab, select the target group, and click Edit.
  3. In the Edit Group window, if you select Domain administrator from the Role drop-down menu, all the users in this group will have the same permissions as the Domain administrator.

To remove groups from a domain:

  1. Select a domain and click Edit.
  2. Go to the Group tab, select the target groups, and click Delete.

To view members:

  1. Select a domain and click Edit.
  2. Go to the Group tab and click View members to check if certain users belonging to the group are not in the domain.

To create an email alias:

You can configure email aliases to group email addresses of specific users, groups, and aliases. When sending emails, users can quickly specify recipients using aliases without entering multiple addresses. Follow the steps below to create an email alias:

  1. Select a domain and click Edit.
  2. Go to the Alias tab and click Create.
  3. Name the new alias in the Alias name field. If the alias carries the same name as an email account's username, the account cannot be automatically added as an alias member.
  4. Select from the drop-down menu to view aliases, users, groups, or external mailboxes. Add the desired ones to the alias.
  5. Click OK to save the settings.

To import/export aliases:

  1. Select a domain and click Edit.
  2. Go to the Alias tab and click Tools at the top to perform the following:

To create an auto BCC rule:

When an inbound or an outbound email matches any auto BCC (Blind Carbon Copy) rules, a BCC email will be automatically created and forwarded to the specified address. This helps users back up important emails and protect recipient privacy. Follow the steps below to create an auto BCC rule

  1. Select a domain and click Edit.
  2. Go to the Auto BCC tab. Click Create to define the trigger conditions:
  3. In the Send BCC to this address field, specify an email address, a username, or an email alias to forward BCC emails to.
  4. Click OK to save the rule.

To import/export an auto BCC rule:

  1. Select a domain and click Edit.
  2. Go to the Auto BCC tab and click Tools on the top to perform the following:

To configure sending limits and daily quotas:

  1. Select a domain and click Edit.
  2. Go to the Usage Limit tab. In the Sending Limit section, adjust the following settings:
  3. In the Daily Quota section, adjust the following settings:
  4. Click OK to save the settings.

Note:

To create a disclaimer rule:

The system can automatically append a custom disclaimer to outbound emails to clarify legal obligations/agreements or to promote a campaign.

You can customize rules to specify when a disclaimer should be appended.

  1. Select a domain and click Edit.
  2. Go to the Disclaimer tab and click Create.
  3. Go to the Rule tab and enter the following information:
  4. Specify matching rules to define when to append the disclaimer to an outbound email:
  5. Specify exception rules to define when not to append the disclaimer to an outbound email:
  6. Go to the Content tab to draft the disclaimer:
  7. Click OK and then Save to save the disclaimer.
  8. Disclaimers that rank higher have higher priority than the ones that rank lower. To change the priority, select a disclaimer and drag and drop it to a suitable position.

Note:

To delete a domain:

Note:

To set a primary domain: