On-Demand Mail Relay

<h2 id="external-odmr-support">External ODMR Support</h2>
<p>The design of ODMR allows the protocol to be used with an SMTP server that doesn't support it natively. A separate application can be used to do the initial ODMR protocol negotiation (EHLO, AUTH and ATRN), then hand over the connection to the SMTP server once the protocol has reached the "reversed" state.
</p>
<h2 id="odmr-transport-example">ODMR transport example</h2>
<p>A typical example of getting emails with ODMR. 
</p><p>For illustration purposes here (not part of protocol), the protocol exchanges are prefixed for the server (>) and the client (<).
</p>
>  220 EXAMPLE.NET on-demand mail relay server ready
<  EHLO example.org
>  250-EXAMPLE.NET
>  250-AUTH CRAM-MD5 EXTERNAL
>  250 ATRN
<  AUTH CRAM-MD5
>  334 <keysequenz>
>  235 now authenticated as example.org
<  ATRN example.org, example.com
>  250 OK now reversing the connection
<  220 example.org ready to receive email
>  EHLO EXAMPLE.NET
<  250-example.org
<  250 SIZE
>  MAIL FROM:<Lester.Tester@dot.foo.bar>
<  250 OK
>  RCPT TO:<l.eva.msg@example.com>
<  250 OK, recipient accepted
...
>  QUIT
<  221 example.org closing connection

On-Demand Mail Relay open-in-new

On-Demand Mail Relay