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Neil_Knight
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Posted: 06 December 2011 at 2:28am | IP Logged Quote Neil_Knight
Why is MailBee.Net SMTP sending my servers private IP address when I send an email?

How can I stop this from happening?
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Alex
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Posted: 06 December 2011 at 2:49am | IP Logged Quote Alex
Do you mean EHLO command argument? If so, you can change it with SmtpServer.HelloDomain property.

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Alex
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Neil_Knight
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Posted: 06 December 2011 at 3:06am | IP Logged Quote Neil_Knight
I current pass in my full server name as the SmtpServer.HelloDomain property e.g. mx1.company.com.

I'm not passing in any other details.
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Alex
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Posted: 06 December 2011 at 3:21am | IP Logged Quote Alex
If you already set SmtpServer.HelloDomain right, I don't understand what you meant then.

Please enable logging with Smtp.Log property and point us where your private IP is passed to the relay server.

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Alex
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Neil_Knight
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Posted: 06 December 2011 at 3:30am | IP Logged Quote Neil_Knight
Well, I actually set the HelloDomain of the smtpContext but it completely ignores it and still passes a null to Hello() method.
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Alex
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Posted: 06 December 2011 at 3:37am | IP Logged Quote Alex
Which code are you using? By the way, there is also another DirectSendServerConfig.HelloDomain property which is used for direct-send mode (while SmtpServer.HelloDomain is for relay servers).

In direct send mode, SmtpServer.HelloDomain is ignored (and cannot be even set because no SmtpServer object exists as the Smtp.SmtpServers collection is empty).

DirectSendServerConfig.HelloDomain is ignored when you send through relay server but the property itself is always available (via Smtp.DirectSendDefaults.HelloDomain syntax).

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Alex
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Neil_Knight
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Posted: 06 December 2011 at 3:53am | IP Logged Quote Neil_Knight
Hi Alex,
Thanks for confirming this. This is exactly what was happening.
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Neil_Knight
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Posted: 06 December 2011 at 4:11am | IP Logged Quote Neil_Knight
The problem I'm having now is the fact that I have multiple IPs on the server. I run the ConnectToServer method, and then it does the Hello method with my domain, but it is returning the wrong IP address when viewing the "Received From" in the message header e.g.

Received: from mx113.company.com (mx111.company.com [11.11.11.11])

Any ideas how I can get the 2 to marry up?
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Alex
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Posted: 06 December 2011 at 8:21am | IP Logged Quote Alex
You may try using LocalEndPoint property (again, it's available in two classes, for relay and for direct-send, just the same way HelloDomain).

It may help you specify your remote IP as client's address.

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Alex
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Neil_Knight
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Posted: 06 December 2011 at 8:23am | IP Logged Quote Neil_Knight
I have found the answer to this. I wasn't assigning the value of the LocalEndPoint. Once I done this, it works as expected.
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Alex
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Posted: 06 December 2011 at 8:26am | IP Logged Quote Alex
I.e. somewhat like:
Code:

IPEndPoint ep = new IPEndPoint(IPAddress.Parse("1.2.3.4"), 5678);
server.LocalEndPoint = ep; // server is SmtpServer instance


You can usually set port to 0 to let the system set the local port automatically (as only IP address matters for you).

regards,
Alex
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Alex
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Posted: 06 December 2011 at 8:27am | IP Logged Quote Alex
Oh, you're quick :-)

Regards,
Alex
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