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Direct send without SMTP relay server
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![What is An SMTP Relay? [A Brief Crash Course] | SocketLabs](https://www.socketlabs.com/wp-content/uploads/2019/04/smtp-server.png "What is An SMTP Relay? [A Brief Crash Course] | SocketLabs")
What is An SMTP Relay? [A Brief Crash Course] | SocketLabs
SMTP Relay
Configuring an Inbound and Outbound SMTP Relay to Complement ISA 2004 Firewall Protection for Exchange Servers
Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS
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Configuring an Inbound and Outbound SMTP Relay to Complement ISA 2004 Firewall Protection for Exchange Servers
Open mail relay - Wikipedia
How to use Mail Contact object to enable outgoing SMTP relay
SMTP Relay: A Definition and Guide - IONOS
