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I have 2 Ubuntu 16.04 virtual machines and I have installed Postfix on both of them.

How can I send a mail between them in localhost?

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I assume, this is sort of test environment, without a real DNS/MX/etc settings? I think you should take a look at https://linux.die.net/man/5/transport. These postfix settings allows you to force the recipient/destination host for some emails. Just setup the destination host for your needs.

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