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+# Forward-Only mailserver with LDAP authentication
+
+## Building a Forward-Only mailserver
+
+A **forward-only** mailserver does not have any local mailboxes. Instead, it has only aliases that forward emails to external email accounts (for example to a gmail account). You can also send email from the localhost (the computer where the mailserver is installed), using as sender any of the alias addresses.
+
+The important settings for this setup (on `mailserver.env`) are these:
+
+```
+PERMIT_DOCKER=host
+ENABLE_POP3=
+ENABLE_CLAMAV=0
+SMTP_ONLY=1
+ENABLE_SPAMASSASSIN=0
+ENABLE_FETCHMAIL=0
+```
+
+Since there are no local mailboxes, we use `SMTP_ONLY=1` to disable `dovecot`. We disable as well the other services that are related to local mailboxes (`POP3`, `ClamAV`, `SpamAssassin`, etc.)
+
+We can create aliases with `./setup.sh`, like this:
+
+```
+./setup.sh alias add <alias-address> <external-email-account>
+```
+
+## Authenticating with LDAP