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Post.Office : Administration : Restricting Mail Relay Print send FAQs by e-mailask a question
Question:I am having trouble figuring out the "Restrict Mail Relaying" System Configuration page. What does all of that mean?
Answer:

Although Post.Office ships as closed relay, it is important to know what the settings on this page are for in case you plan on making changes. The Administration Guide goes into detail about the functions of each field, but this page should give some general guidelines to follow.

Here is an example of the page with some comments:





External Relay Restrictions:


Don't restrict relay mail
^^ Enabling this will make your server "open relay" and should only be used in closed networks.


In general, don't restrict relay mail except as indicated below:
^^ Enabling this will make your server "open relay" to most servers and should only be used in closed networks.


Restrict relay from these IP addresses:



and/or


Restrict relay from these domains:

(based on envelope Mail From: Address)



Restrict all relay mail
^^ Enabling this will make your server "closed relay" to all clients, even those on your network. This will not be a problem if Pop-Before SMTP is enabled.


In general, restrict relay mail except as indicated below:
^^ Enabling this will make your server "closed relay" except to the clients indicated. (Default)

Allow relay from these IP addresses:
^^ By enabling this, you can specify the IP address ranges that will be allowed to relay. You should enter in your main network IP ranges below.




and/or


Local Mail Domains
^^ Enabling this will make your server "open relay" because this data can be easily forged by relayers.


and/or


Additional domains:
^^ Enabling this will make your server "open relay" because this data can be easily forged by relayers.


(based on envelope Mail From: Address)








If relay mail is restricted as specified above, use the following delivery options:


Allow delivery to:


No domain except those listed below:
^^ Enabling this item is OK, and will make sure mail sent to your domain does not get restricted. (Default)



Local Mail Domains
^^ Enabling this item is OK, and will make sure mail sent to your domain does not get restricted. (Default)


and/or


Additional Domains:
^^ Enabling this item is OK, but should only be used when your Post.Office server is a secondary mail server.





Any domain except those listed below:
^^ Enabling this will make your server "open relay" and should only be used in closed networks.






Local Mail Domains:
(for reference)


lists.tenon.com

mail.tenon.com

tenon.com




affected program versions:3.5.3
affected operating systems:Mac OS X
last updated 29.01.2003
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