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OpenSMTPD over the clouds

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OpenSMTPD over the clouds
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the story of an HA setup
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490
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CC Attribution 2.0 Belgium:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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OpenSMTPD has gained filters support in its latest version and it is a now an smtp server that can compete with other better known mail servers and can be used to handle both incoming and outgoing mail flows in a secure way. Its simple configuration and its "secure by design" approach makes it one of the best candidates for a mail server software. Now that OpenSMTPD has gained filter support it can be used as a mail server with all features of other email servers. This is the story of how OpenSMTPD can be setup in an high availability environment and how other OpenBSD tools can be used to achieve the goal.