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Help, configuration and tips.

SMTP Settings
The SMTP settings dialog allows you to modify the behavior of both the incoming SMTP service and the outgoing SMTP service. Below is a list of what each control means and how you can use it.

  • Incoming SMTP Port - This controls the port for which incoming mail connections will be accepted. Please note that it is strongly recommend you do not change this value. The SMTP standard specifies that all SMTP servers must use port 25 and changing this value may prevent you from receiving incoming mail off the Internet. However, if you are using ICS, a router or a firewall then you must ensure that the port forwarding listens on port 25 and forwards to the port value specified here.
  • Incoming SMTP Listen Only on IP - This allows you to bind the listening port to a single IP address. If an host name is provided then it will be converted to an IP address which will then be used for binding.
  • Enable Outgoing SMTP - If you want to use Ability Mail Server to handle your outgoing mail, then you must enable this option. You must also ensure the outgoing mail service is setup correctly and has been enabled as all outgoing mails will be routed through that service for delivery across the Internet.
  • Outgoing SMTP Port - This controls the port for which outgoing mail connections will be accepted. It is possible for both Incoming and Outgoing ports to be the same or different. However, for security reasons we strongly recommend you select a none-standard port (eg. 2525). When configuring your mail client, you must set the port value used for the outgoing SMTP to match the port value specified here. If an email is received on this port which is destined for an account hosted by Ability Mail Server, then it will be delivered directly without ever passing through the outgoing mail service.
  • Outgoing SMTP Listen Only on IP - This allows you to bind the listening port to a single IP address. If an host name is provided then it will be converted to an IP address which will then be used for binding.
  • Access Control - See the section 'Outgoing SMTP Access Control'...below.
  • Max Connections Per Port - This controls the maximum simultaneous connections per port. This value is normally automatically generated by the setup wizard, however, if you wish you can adjust it manually. Please note that rerunning the wizard will overwrite any change you make to this value.
  • Max Recipients Per Mail - This is the maximum number of recipients that are allowed to be sent during an SMTP mail transaction. Increase this value if you need to send an email to a large number of email addresses.


Outgoing SMTP Access Control
If you enabled the SMTP In and Outgoing SMTP, then you should set up your Outgoing SMTP security options. These controls allow you to restrict what computers can use your Outgoing SMTP and so there fore protect yourself against unauthorized use. If you don't enable any of the access options then your Outgoing SMTP will be useable from any computer on the Internet or in your LAN. If you enable both options, then any incoming connection must match both the IP Range and also provide a correct user name and password.

  • Enable SMTP Authentication - This will ensure only connections which give the correct user name and password are allowed to send outgoing emails. If your SMTP In and Outgoing SMTP use the same port, then this information will be used to decide which connections are entitled to outgoing privileges.
  • Allow Any Accounts Login Details - This allows the login details of any of the accounts hosted by Ability Mail Server as the user name and password. This option will any of your users to use your Outgoing SMTP safely without leaving your Outgoing SMTP open to unauthorized use.
  • Allow Only The Following... - This will allow you to set and allow only a single user name and password for the Outgoing SMTP.
  • Enable IP Range Control - This allows you to restrict connections to the outgoing SMTP to a selection of IP's. If your SMTP In and Outgoing SMTP use the same port, then this information will be used to decide which connections are entitled to outgoing privileges. If your SMTP In and Outgoing SMTP use different ports, then connections to the Outgoing SMTP which do not fit into this range will instantly be disconnected.
  • Block IP addresses assigned to this computer - If enabled, any IP address assigned to the computer that is running the mail server will be blocked and disallowed access to the outgoing SMTP. This can be used for extra protection against IP spoofing (where a remote computer can fake its originating IP).
  • Safe IP's - This option allows you to always allow certain IP's access to the Outgoing SMTP. This is useful if you want to enable SMTP Authentication but also want to allow some computers access without these security requirements. This can be useful when using PHP mailing scripts to send mail via your Outgoing SMTP. Please note that Safe IP's ALWAYS overrule any restrictions, therefore be careful which IP's are placed in this list.
  • Allow IP Addresses Assigned to this Computer - If enabled, any IP addresses assigned to the computer that is running the mail server will be classed as a safe IP and will always be allowed access to the Outgoing SMTP. Please note that this setting, like other Safe IP's, also overrules any restrictions.