Service
You can manage popular mail protocols used by MailPlus Server to let it communicate with external mail servers and third-party clients.
SMTP
MailPlus Server uses the SMTP protocol to communicate with mail servers and third-party mail clients.
- Click Service on the left panel, and go to SMTP.
- Enable the following SMTP-related protocols:
- Enable SMTP: Select to allow mail servers/clients to communicate with MailPlus Server via SMTP.
- Account type: Select the source of user accounts (i.e. local users, LDAP users, or Windows AD domain users) that are allowed to build up SMTP connection.
- Port: Assign a port for SMTP connection. The default SMTP port is 25.
- Enable SMTP-SSL: Select to allow mail servers/clients to communicate with MailPlus Server via SSL-protected SMTP. You can assign a port for SMTP-SSL connection.
- Enable SMTP-TLS: Select to allow mail servers/clients to communicate with Mailplus Server via TLS-protected SMTP. You can assign a port for SMTP-TLS connection.
- Click Apply to save the settings.
Note:
- If you have enabled SMTP-TLS in MailPlus Server and set the TLS/SSL Profile Level to Modern compatibility at DSM Control Panel > Security > Advanced, some mail clients (e.g., Outlook 2016) may be unable to establish connections due to this setting. To ensure better compatibility with mail clients, please change the TLS/SSL Profile Level to Intermediate compatibility.
Network Interface
You can bind the SMTP, POP3, and IMAP services to one network interface.
- Click Service on the left panel, and go to Network Interface.
- In the Network Interface menu, select a desired interface.
- Click Apply to save the setting.
IMAP/POP3
MailPlus Server uses the IMAP and POP3 protocols to communicate with popular third-party mail clients (e.g., Apple Mail and Microsoft Outlook).
- Click Service on the left panel, and go to IMAP/POP3.
- Enable the following mail protocols to allow POP3/IMAP connection from third-party mail clients:
- Enable POP3: Select to allow POP3 client connection. POP3 allows users to fetch emails from MailPlus Server to a mail client.
- Enable POP3 SSL/TLS: Select to allow POP3 client connection protected with SSL/TLS.
- Enable IMAP: Select to allow IMAP client connection. IMAP allows users to fetch emails from MailPlus Server to a mail client and manage their mailboxes.
- Enable IMAP SSL/TLS: Select to allow IMAP client connection protected with SSL/TLS.
- Click Apply to save the settings.
Note:
- If you have enabled POP3 SSL/TLS or IMAP SSL/TLS in MailPlus Server and set the TLS/SSL Profile Level to Modern compatibility at DSM Control Panel > Security > Advanced, some mail clients (e.g., Outlook 2016) may be unable to establish connections due to this setting. To ensure better compatibility with mail clients, please change the TLS/SSL Profile Level to Intermediate compatibility.
Full-Text Search
The system can index all users' mail content and provides thorough email search to find specific messages fast and accurately.
- Click Service on the left panel, and go to Full-Text Search.
- Select Enable full-text search to index all mail content for full-text search.
- To have accurate search in mails written in Chinese/Japanese/Korean characters, select Allow character search for Chinese, Japanese, and Korean mail.
- Click Apply to save the settings.
Note:
- Enabling full-text search requires more system resource.