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Category: Email 
Status: General 
KB Article ID: 55 

SMTP Relay and Dynamic SMTP at the same time

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From a customer:

"Is it possible to use your SMTP servers (smtp.changeip.com port 5072) for outgoing mail AND use you dynamic SMTP services at the same time (to get incoming mail at my mail server) for the same domain? I have an ISP that blocks port 25. I would need to have your SMTP port forwarding service---but it seems like I can only do one or the other. What can I do?"

Solution:

You need to setup the smtp relay service using a phantom or alias domain name. We cannot configure an email domain to be both types of service on our mail server, so we simply create an 'authentication' domain. If your domain name is example.com, use something like relay.example.com as the domain for the mailboxes that you will setup. This domain does not need to really exist, it is simply used for a place to put a mailbox that you can authenticate with. This mailbox does not need to be used for incoming mail, you simply use it for outgoing mail relay. Once you've added this relay.example.com domain, add a mailbox like relay@relay.example.com or outgoing@relay.example.com. On your mail server or client you then use SMTP AUTH with that email address and password that you just created.




Keywords: relay | both | service | outbound
Article created on Sunday, November 28, 2004 by Sam