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Is the goal to over-ride the destination address that the app server puts on the e-mail and send the e-mail to a different address? &nbsp; An SMTP 'relay' server won't do that; it accepts mail, then tries to deliver it to the addressee. &nbsp;However, some SMTP server can be configured to send an additional copy of the message to a pre-configured e-mail address. &nbsp;This is often done for archiving purposes. &nbsp;If you DO want the SmarterMail host to relay the messages, simply adding the IP address of the app server to SmarterMail's &quot;relay mail for...&quot; configuration should be enough.
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Is the goal to over-ride the destination address that the app server puts on the e-mail and send the e-mail to a different address?   An SMTP 'relay' server won't do that; it accepts mail, then tries to deliver it to the addressee.  However, some SMTP server can be configured to send an additional copy of the message to a pre-configured e-mail address.  This is often done for archiving purposes.  If you DO want the SmarterMail host to relay the messages, simply adding the IP address of the app server to SmarterMail's "relay mail for..." configuration should be enough.

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I used SmarterMail support to arrive at my conclusion.
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I used SmarterMail support to arrive at my conclusion.

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Our goal for SmarterMail is to use it to relay / forward all SMTP email from an app server to a single email address. What is the best strategy / configuration for this purpose?
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Our goal for SmarterMail is to use it to relay / forward all SMTP email from an app server to a single email address. What is the best strategy / configuration for this purpose?

SmarterMail as relay / forwarder

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.