Re: [exim-dev] EXPERIMENTAL_PROXY clarification

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Auteur: matthew.schlosser
Datum:  
Aan: E.Istomin, exim-dev
Onderwerp: Re: [exim-dev] EXPERIMENTAL_PROXY clarification
I don’t think my question was well understood. We are looking to implement Exim as a scalable cloud-based MTA, but without egress access to the internet. Exim’s feature set and performance are excellent for this, but the lack of SOCKS support prevents us from implementing it. I don’t think HAProxy can provide egress SOCKS support.

Please excuse my poor ASCII diagram.

             +---------------+
             |SMTP (internal)|
             +------+--------+
                    |
             +------+--------+
             |  (internal)   |
             | Load Balancer |
             |               |
             +---------------+
     +-------+---------------+---+
     |              |            |
     |              |            |
+----+----+   +-----+---+   +----+----+
|Exim Node|   |Exim Node|   |Exim Node|  ... -> Scale to infinity (internal)
+---+-----+   +----+----+   +----+----+
    |              |             |
    |              |             |
+---v--------------v-------------v-----+

|                                      |
|           Socks 4/5 Devices          |
|              (external)              |

+-------------------+------------------+
                    |
                    |
+------------------+-------------------------+

|                                            |
|     Internet/TCP/IP (MX routing out SOCKS) |
|                                            |

+--------------------------------------------+

From: Eugene Istomin [mailto:E.Istomin@edss.ee]
Sent: Tuesday, February 10, 2015 3:03 AM
To: exim-dev@???
Cc: Schlosser, Matthew (TR Technology)
Subject: Re: [exim-dev] EXPERIMENTAL_PROXY clarification


Matthew,



this is protocol made by Willy Tarreau - "The PROXY protocol provides a convenient way to safely transport connection information"



So, Haproxy as frontend, exim as backend (we are using exim as localhost:25 listener)

---

Best regards,

Eugene Istomin



On Friday, February 06, 2015 11:34:28 PM matthew.schlosser@???<mailto:matthew.schlosser@thomsonreuters.com> wrote:

> I'm reviewing the EXPERIMENTAL_PROXY documentation and it looks like this


> allows me to use Exim as a proxy.


>


> Is there any way to do the inverse? I'm thinking a transport option to send


> via a socks proxy. The idea is to use Exim MTA inside an environment with


> no default route to the internet.


>


> Along the lines of:


>


> begin transports


> proxy_smtp:


> driver = smtp


> proxy = <socks4|5>:<proxy host or ip>:<port> (or equivalent lookup)


>


> Matthew Schlosser