Difference between revisions of "Email relay"
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Our server will forward all emails to another SMTP server. The SMTP server we're gonna install is stupid: only local domain, no account checking, no anti-virus or spam protection.  
 
Our server will forward all emails to another SMTP server. The SMTP server we're gonna install is stupid: only local domain, no account checking, no anti-virus or spam protection.  
  
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# From main SMTP server ("Gmail", "Outlook", ...) all emails come from the same account.
 
 
# From a local point of view, all emails are send using Linux default configuration and system users
 
# From a local point of view, all emails are send using Linux default configuration and system users
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# From the other hand - the big SMTP server ("Gmail", "Outlook", ...) - all emails come from the same account
  
  
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As you can see, POSTFIX SMTP server will just act as a proxy between local services and Gmail.
 
As you can see, POSTFIX SMTP server will just act as a proxy between local services and Gmail.
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=When to use it ?=
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If you only have a single server and want to monitor it, then use a relay! That's much easier than setup a complete email server. It's also easier to maintain!
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=Installation=
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apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules
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Edit Postfix configuration
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Set SMTP relay and SASL settings
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Create login / password file
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vim /etc/postfix/sasl_password
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Put the following content
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[smtp.gmail.com]:587    USERNAME@gmail.com:PASSWORD
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Set rights
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chmod 640 /etc/postfix/sasl_password
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chown postfix:postfix /etc/postfix/sasl_password
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Compute new hash for postfix
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chown -R postfix /etc/postfix
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postmap /etc/postfix/sasl_password
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Create TLS policy file
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vim /etc/postfix/tls_policy
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Put the following content
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[smtp.gmail.com]:587 encrypt
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Compute new hash for postfix
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postmap /etc/postfix/tls_policy
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Test you configuration
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Check your logs!
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cat /var/log/mail.log
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cat /var/log/mail.err
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=Sources=

Revision as of 10:15, 13 August 2014


Principle

Our server will forward all emails to another SMTP server. The SMTP server we're gonna install is stupid: only local domain, no account checking, no anti-virus or spam protection.

  1. From a local point of view, all emails are send using Linux default configuration and system users
  2. From the other hand - the big SMTP server ("Gmail", "Outlook", ...) - all emails come from the same account


Principle:

SMTP server relay


As you can see, POSTFIX SMTP server will just act as a proxy between local services and Gmail.



When to use it ?

If you only have a single server and want to monitor it, then use a relay! That's much easier than setup a complete email server. It's also easier to maintain!



Installation

apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules


Edit Postfix configuration



Set SMTP relay and SASL settings



Create login / password file vim /etc/postfix/sasl_password


Put the following content [smtp.gmail.com]:587 USERNAME@gmail.com:PASSWORD


Set rights chmod 640 /etc/postfix/sasl_password chown postfix:postfix /etc/postfix/sasl_password


Compute new hash for postfix chown -R postfix /etc/postfix postmap /etc/postfix/sasl_password


Create TLS policy file vim /etc/postfix/tls_policy


Put the following content [smtp.gmail.com]:587 encrypt


Compute new hash for postfix postmap /etc/postfix/tls_policy


Test you configuration


Check your logs!

cat /var/log/mail.log

cat /var/log/mail.err




Sources

Retrieved from "http://www.daxiongmao.eu/wiki/index.php?title=Email_relay&oldid=1121"