Interesting concept to say the least. I am intrigued as to how you accomplish that with Postfix/BSD. I assume you have a cronjob attempting to open port 25 on the primary and starting / stopping postfix as required???
roughly
What if your primary and mx mail servers are located in different datacenters and the MX is not accepting connections because it 'knows' the primary is up BUT the sending mail server elsewhere on the internet is unable to connect to the primary? Sure it will try the MX, but as stated above, the MX can see theprimary so it is not going to accept mail.
there's always a way :)
I know you have done some excellent work and come up with great solutions. As a fellow postfix user I'm curious to hear more how you control this.
I'm sure you would :)
Len
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