What is a "client"? A single IP address? What about NAT?

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What is a "client"? A single IP address? What about NAT?

postfix-list

 

In the smtpd_client_* section of postconf(5) the word "client" is used frequently.  What does a single "client" entail?  If multiple users are behind a NAT box do they all apear to be a single "client"?

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Re: What is a "client"? A single IP address? What about NAT?

Ralf Hildebrandt
* [hidden email] <[hidden email]>:
>  
> In the smtpd_client_* section of postconf(5) the word "client" is
> used frequently.  What does a single "client" entail?  If multiple
> users are behind a NAT box do they all apear to be a single "client"?

Yes.
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Ralf Hildebrandt
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Re: What is a "client"? A single IP address? What about NAT?

Barney Desmond
In reply to this post by postfix-list
2009/7/6  <[hidden email]>:
> In the smtpd_client_* section of postconf(5) the word "client" is used
> frequently.  What does a single "client" entail?  If multiple users are
> behind a NAT box do they all apear to be a single "client"?

A NAT, as commonly used in SoHo environments for
masquerading/Source-NAT, effectively reduces all hosts behind it to a
single identity. Postfix will see one "client".