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This tutorial is now available as the Amahi [https://www.amahi.org/apps/postfix-mail-relay Post Mail Relay] application. This can be used to send mails from your Amahi 7 or greater (Fedora 19 or greater) HDA and to receive system emails.<br> To receive emails meant for the root user, you have to [[Forward_System_Emails|Forward System Emails]] after finishing thistutorial. You also might want to take a look at [[Masquerade_email_address|Masquerade email address]] as well.<br>I took the information from REF: [http://carlton.orileyopentodo.net/blog2013/?p=31 this page] and modified them slightly for Fedora 14 03/ Amahi 6postfix-smtp-relay-to-smtp-gmail-com Postfix SMTP relay to SMTP gmail. <br><br>com] * First of all, install postfix and remove sendmail: <br>{{Code|<pre>yum -y install postfixmailxyum -y remove sendmail}}Openssl and openssl-perl are needed to generate certificates and create SSL connections to GMail<br>Openssl should be installed already, but to be sure: <br>{{Code|yum -y install openssl openssl-perl}}A Certificate Authority is needed to create the necessary certificates. You can skip the next paragraph if you already have one:<br>{{Code|cd /etc/pki/tls/misc./CA.pl –newca}}*You will be prompted for the file name, hit enter to create a new CA.* You will need to enter a passphrase next, be sure to remember it.*Choose the Country Name, State or Province Name, Locality Name, Organization Name, and Organizational Unit Name to your liking. Be sure to remember the values, they will be needed in the key creation later. *For the Common Name, type “CA” (without quotes). *Take defaults for everything else and when prompted enter the passphrase from above.<br>Now a key that is sent to Gmail to start the SSL encryption will be created: <br>{{Code|cd /etc/pki/tlsmkdir gmail_relaycd gmail_relayopenssl genrsa -out server.key 1024openssl req -new -key server.key -out server.csr}}You will be prompted for country etc. like when creating the CA. Enter the same values. <brpre>As Common Name, now enter the name of your server, FQDN or not, your choice. <br>{{Code|openssl ca -out server.pem -infiles server.csr}}You will need to enter your passphrase again at this point.<br>When asked if you want to sign the key, answer yes, same when asked if to commit it.

* Add the following to the bottom of the file /etc/postfix/main.cf. You do not need to change anything else in it, as the last setting for any option is the one that is saved.{{Text|Text=<nowikipre>####</nowiki> Gmail SSL SMTP Relay#TLS parameterssmtpd_use_tls=yessmtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scachesmtp_tls_session_cache_database = btree:${data_directory}/smtp_scachesmtp_tls_note_starttls_offer = yessmtp_tls_policy_maps = hash:/etc/postfix/tls_policy #Relay host configuration

<nowiki>#</nowiki>authSASL Configuration

* Build the password database: <nowikibr>#</nowikipre>tlssmtp_use_tls = yessmtp_sasl_security_options = noanonymoussmtp_sasl_tls_security_options = noanonymoussmtp_tls_note_starttls_offer = yestls_random_source = devpostmap hash:/dev/urandomsmtp_tls_scert_verifydepth = 5smtp_tls_key_file = /etc/pki/tls/gmail_relay/server.keysmtp_tls_cert_file = /etc/pki/tls/gmail_relay/server.pemsmtpd_tls_ask_ccert = yessmtpd_tls_req_ccert = nosmtp_tls_enforce_peername = no}}Create /etc/postfix/sasl_passwd file with your Gmail login credentials that looks like below:{{Text|Text=gmail-smtp.l.google.com user@gmail.com:passwordsmtp.gmail.com user@gmail.com:password}}</pre>

Obviously, you need to change ''user'' to your username and ''password'' to your * Create /etc/postfix/tls_policy file that looks like below:<pre>[smtp.gmail password. com]:587 encrypt</pre><br/>Create * Build the password policy database: <br>{{Code|<pre>postmap hash:/etc/postfix/sasl_passwd}}tls_policy</pre>

* Protect the files with your Gmail login data:{{Code|<pre>chmod 600 /etc/postfix/sasl_passwd

chown postfix /etc/postfix/sasl_passwd.db}chown postfix /etc/postfix/tls_policychown postfix /etc/postfix/tls_policy.db--> * Restart Postfix:<pre>systemctl restart postfix.service</pre> * Set Postifx to start on boot:<pre>systemctl enable postfix.service</pre> * Now try sending a mail, it should reach your Gmail account:<pre>echo test 1 2 | mail -s "Test mail" user@gmail.com</pre>  <b>NOTE:</b> Some ISPs will block emails sent using this method. Looking for a work around. == Troubleshooting ==* If you get the message " warning: SASL authentication failure: No worthy mechs found", install this package. yum install cyrus-sasl{,-plain}

:Restart Postfix{{Code|/etc/init.d/ systemctl restart postfix restart}}

Now try sending a mail, it should reach your Gmail account* Receive the following message:{{Code|echo test 1 2 <nowiki>|</nowiki> mail -s "Test mail" user@ connect to smtp.gmail.com}}[2607:f8b0:400e:c05::6d]:587: Network is unreachable:To correct this problem, change /etc/postfix/main.cf as follows: inet_protocol = ipv4:Restart postfix systemctl reload postfix