Hello! Cna you help how to install it?
I added: 
        add-apt-repository ppa:lamont/postfix

The problem:
W: GPG error: http://ppa.launchpad.net/lamont/postfix/ubuntu zesty InRelease: 
The following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY CD264BE5EA87984F
E: The repository 'http://ppa.launchpad.net/lamont/postfix/ubuntu zesty 
InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore 
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration 
details.

How can I install so I can use postfix the last fix  fo the fatal:
unknown service: private/dovecot-lmtp/tcp?

THANKS!

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https://bugs.launchpad.net/bugs/1654453

Title:
  LMTP delivery to Dovecot stops working in 3.1.4-1

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