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# MDaemon Email Server 25.5

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Ports | Scroll Prev Top Next More

SMTP, ODMR, & MSA Ports

SMTP inbound port

MDaemon will monitor this TCP port for incoming connections from SMTP clients. This is the main SMTP port, which in most cases should be left at the default setting of port 25.

SMTP outbound port

This port will be used when mail is sent to other SMTP servers.

MSA inbound port

This is a Message Submission Agent (MSA) port that can be used by your users as an alternative to the SMTP inbound port specified above. Transmission on this port requires AUTH, therefore users sending on that port must configure their mail clients appropriately to ensure that their connections are authenticated. Further, because some ISPs block port 25, your remote users might be able to circumvent that restriction by using the MSA port instead. If you do not wish to designate an MSA port then set the value to "0" to disable it.

| Connections to the MSA port are exempt from PTR and reverse lookups, Host and IP screening, the IP Shield, and Tarpitting. MSA port connections continue to utilize dictionary attack connection limiting.

ODMR inbound port

MDaemon will monitor this port for incoming On-Demand Mail Relay (ODMR) connections, such as ATRN from Gateway Domains.

SMTP SSL port

This is the port dedicated to SMTP mail sessions using a Secure Sockets Layer (SSL) connection. See SSL & Certificates for more information.

POP & IMAP Ports

POP inbound port

MDaemon will monitor this port for incoming connections from remote POP clients.

POP outbound port

This port will be used when MDaemon retrieves mail from POP servers.

IMAP inbound port

MDaemon will monitor this port for incoming IMAP requests.

POP SSL port

This is the port dedicated to POP mail clients using a Secure Sockets Layer (SSL) connection. See SSL & Certificates for more information.

IMAP SSL port

This is the port dedicated to IMAP mail clients using a Secure Sockets Layer (SSL) connection. See SSL & Certificates for more information.

Other Ports

DNS outbound port

Enter the Port you want MDaemon to use for sending and receiving datagrams to the DNS server.

Remote Admin port

This is the port that MDaemon will monitor for Remote Administration connections.

Minger port

This is the port that the Minger server will monitor for connections.

Return port settings to defaults

This button returns all the port settings to their standard values.

Bind to new port values now

When you alter the values of any of the port settings you will need to press this button to have your changes take immediate effect. Otherwise, your changes will not be put into place until the next time the server is started.

| The preceding port settings are critical for proper server operation and should not be altered unless you are certain that you must do so. Being able to configure the ports that MDaemon uses will allow you to configure the server to operate with proxy systems or other software services that require certain port numbers. An IP address (a machine) has only one of each available port. If one program attempts to gain access to a port that is already in use by another program, an error message will inform the user that the requested address (IP:PORT) is already in use.

MDaemon v25.5.0 - October 2025. Copyright © 1996-2025. All rights reserved. MDaemon Technologies