Differences

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--- linux:postfix [2017/03/10 19:08] – created rlunaro
+++ linux:postfix [2022/12/02 22:02] (current) – external edit 127.0.0.1
@@ Line 12: / Line 12: @@
 <code>
 sudo apt-get install postfix
+sudo apt-get install mailutils
 </code>
@@ Line 20: / Line 21: @@
 <code>
 cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
+</code>
+This is my configuration for a host that it is isolated in internet, and
+it has no special needs (it is not the mail server for any domain, it only
+needs to send some emails):
+<code>
+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+mail_owner = postfix
+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+myhostname = cloud.mister-i.com
+mydomain = mister-i.com
+myorigin = $myhostname
+mydestination = $myhostname, localhost, novaprime
+mynetworks_style = host
+relay_domains = $mydestination
+smtp_generic_maps = hash:/etc/postfix/generic
+smtpd_banner = $myhostname ESMTP $mail_name
+biff = no
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+readme_directory = no
+compatibility_level = 2
+inet_interfaces = all
+inet_protocols = all
+smtpd_use_tls = no
+smtp_use_tls = no
+</code>
+It's very important to configure the file ''/etc/postfix/generic'' with a remapping of the local
+users to complete email addresses:
+<code>
+# REMEMBER!!!! After making changes to this file you must run:
+#
+# postmap /etc/postfix/generic
+#
+#
+username   username@complete.server.address.com
+</code>
+In that way, every outgoing email is rewrited from username@localhost to username@complete.server.address.com and nowadays email servers can recognize it as a valid email
+address.
+After that **don't forget to run postmap /etc/postfix/generic** in order to update the database with the fresh configuration.
+==== Open firewall ====
+<code>
+ufw allow 25
+</code>
+http://serverfault.com/questions/149903/what-ports-to-open-for-mail-server
+==== Do some testing ====
+<code>
+mail --subject="hello from server" destination-address@example.com
 </code>