put lmtp socket into Postfix' chroot as well
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1 changed files with 15 additions and 7 deletions
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@ -26,27 +26,35 @@ each other.
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## Dovecot listens to LMTP
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There's nothing to do for you here. I just want to tell you how it works. By default Dovecot has this section in its
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`/etc/dovecot/conf.d/10-master.conf` file:
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Edit the `/etc/dovecot/conf.d/10-master.conf` file and change the section called `service lmtp`:
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```
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service lmtp {
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unix_listener lmtp {
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}
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unix_listener /var/spool/postfix/private/dovecot-lmtp {
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mode = 0600
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user = postfix
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group = postfix
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}
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```
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So Dovecot has already put a socket into `/var/run/dovecot/lmtp` where it is ready to receive LMTP connections. A socket
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is similar to a TCP port but it's only available for other processes running on same system. So nothing to do.
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The first `unix_listener lmtp` is just used internally by Dovecot and does not concern us. The second part is what you
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will be adding. It makes Dovecot create a socket file at `/var/spool/postfix/private/dovecot-lmtp`. As Postfix has its
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home in `/var/spool/postfix` it can access that socket to speak LMTP with Dovecot.
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A socket is similar to a TCP port but it's only available for other processes running on same system. That's why you
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also set the access mode, user and group so that Postfix can actually use it.
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## Postfix talks to Dovecot using LMTP
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The “_virtual_transport_” in Postfix defines the service to use for delivering emails to the local system. Dovecot has
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The “_virtual_transport_" in Postfix defines the service to use for delivering emails to the local system. Dovecot has
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created a socket file and is ready to listen to incoming LMTP connections. We just need to tell Postfix to send emails
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there. So please run:
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```sh
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postconf virtual_transport=lmtp:unix:/var/run/dovecot/lmtp
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postconf virtual_transport=lmtp:unix:private/dovecot-lmtp
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```
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The syntax looks crazy, but it’s actually simple. You just told Postfix to use the LMTP protocol. And that we want to
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