Postix transport smtp failover
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SimonJGreen
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Published on 2012-11-14T09:59:27Z
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2012/11/14
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We have a multi-tenant email relay set up that has a transport map file that looks like this:
domain1.com smtp:mail.domain1.com
domain2.com smtp:mail.domain2.com
domain3.com smtp:mail.domain3.com
[etc]
In the event mail.domain1.com is down, email for domain1.com will be held by the postfix server until mail.domain1.com starts responding again. However we have a customer who has a backup DSL line on their site, an their email server is also available over this. How can I tell the transport to failover to a different host if the first is unavailable?
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