MailEnable Professional Guide
SMTP - Inbound

Setting

Description

Port Settings

SMTP Port:

SMTP service listens on port:

Determines the port the SMTP service is to listen on. The default is 25. Inbound SMTP connections from remote servers expect the mail server to be listening on port 25, but some proxy or gateway software may require this to be changed.

Requires SSL:

Enables SSL certificate encryption for the port.  Please refer to Server Configuration - Secure Sockets Layer (SSL) encryption for information on how to enable SSL for the server.

Requires connections to authenticate before sending email:

When this option is enabled all inbound connections will be forced to authenticate on the default SMTP port before being able to send a message to a locally hosted mailbox.

Submission Port:

Listen on alternative port:

Determines the alternative port the SMTP service is to listen on.

Requires SSL:

Enables SSL certificate encryption for the port.  Please refer to Server Configuration - Secure Sockets Layer (SSL) encryption for information on how to enable SSL for the server.

Requires connections to authenticate before sending email:

When this option is enabled all inbound connections will be forced to authenticate on the submission port before being able to send a message to a locally hosted mailbox.

Advanced Settings

Maximum number of concurrent connections:

The number of connections that will be available for remote servers and email clients to connect to.

Advertised Maximum message size:

Entering a value here will inform remote mail servers and email clients of the maximum size of an email that should be sent to the server. The size is represented in bytes. Clients or remote mail servers may ignore the value. A size of 0 means that there is no limit on message size.

Enforce this message size:

Checks each inbound message size after it is received. If it is over the limit, it will be deleted and an error returned to the remote server or email client that is trying to send..

IP Address Connection Restrictions

Access Control

Specify who can connect to the email server. Specify a list of IP addresses that are either banned from connecting, or are the only ones allowed to connect. Use the * character as a wildcard.

Inbound IP Bindings

Select the IP addresses that the SMTP service will be bound to. On a multi-homed machine it may desirable to only listen to connections on particular IP addresses. ‘Always bind the service to all available IP addresses’ will allow connections on all IP addresses that are configured for the machine.

Allow IPv6 client connectivity  Enabling this option will will allow connections from clients using IPv6 addresses.

 

 

 


© MailEnable Pty. Ltd. All Rights Reserved.