(default) - Domino declares its maximum message size to connecting
hosts and checks the sending host's estimates of message size before
accepting transfer. If the sender indicates that a message to be
transferred is larger than the maximum size, Domino returns an error
indicating that it will not accept the message
Disabled - Domino does not advertise its maximum message size or check inbound message size before transfer.
Pipelining extension (RFC 1854)
Enabled (default) - Improves performance by allowing Domino to accept multiple SMTP commands in the same network packet.
Disabled - Domino does not accept multiple SMTP commands in a single packet.
DSN extension (RFC 3461) )
- Domino supports incoming requests to return delivery status
notifications to the sender for failed, delayed, delivered, and relayed
messages. Domino sends delay reports for low-priority messages held
until the low-priority routing time to the sender of an SMTP message
Disabled (default) - Domino does not return delivery status notifications for SMTP messages. Domino will return failed DSNs.
8-bit MIME extension (RFC 1652)
Enabled - Domino accepts 8-bit messages as is, allowing reception of unencoded multinational characters.
Disabled (default) - Domino requires inbound messages containing 8-bit characters to be sent using 7-bit ASCII encoding.
Enabled (default) - In response to the Help command, Domino displays a list of supported commands.
Disabled - Domino ignores the Help command.
VRFY command (RFC 821 section 3.3)
Enabled - Domino accepts inbound requests to verify user names.
Disabled (default) - Domino denies requests to verify user names.
EXPN command (RFC 821 section 3.3)
Enabled - Domino expands mailing lists or groups to show individual recipient names.
Disabled (default) - Domino does not expand lists and groups.
ETRN command (RFC 1985)
- Domino accepts inbound "pull" requests from other SMTP hosts to
transfer messages destined for the calling server. Enabling ETRN
support allows for more efficient use of bandwidth resources by
allowing a remote SMTP host to request pending messages at the same
time it transfers messages to the Domino server.
Disabled (default) - Domino does not accept inbound "pull" requests from other SMTP hosts.
SSL negotiated over TCP/IP port (RFC 2487 and RFC 3207)
Enabled - Domino supports the STARTTLS command, allowing it to create an encrypted SSL channel over the SMTP TCP/IP port.
Required - Domino accepts inbound SMTP connections over the TCP/IP port only from hosts that issue the STARTTLS command.
Disabled (default) - Domino does not allow secure SSL connections over the SMTP TCP/IP port.
accepting the STARTTLS command from a remote server, Domino uses
settings for the server's SSL port to govern authentication for the
sessions. For Domino to authenticate remote hosts that use the SMTP
AUTH command, name and password authentication must be enabled for the
Domino SSL port. We'll cover how to configure the server's SSL port in
part two of this article series.