Difference between revisions of "Postfix"

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(might need the CA file)
(adds image, link to postfix.org, security section, version section)
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# work-around for Digital Ocean's blocking of IPv6 for email
 
# work-around for Digital Ocean's blocking of IPv6 for email
 
smtp_bind_address = 0.0.0.0
 
smtp_bind_address = 0.0.0.0
−
# or set inet_protocols = ipv4
 
 
# satellite configuration
 
# satellite configuration
 
smtp_use_tls = yes
 
smtp_use_tls = yes
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smtp_sasl_security_options = noanonymous
 
smtp_sasl_security_options = noanonymous
 
smtp_sasl_tls_security_options = noanonymous
 
smtp_sasl_tls_security_options = noanonymous
−
# list of CAs to trust when verifying server certificate
 
−
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
 
  
 
HERE
 
HERE
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== Version ==
 
== Version ==
 
Run <code>postconf -d | grep mail_version</code> to find out your Postfix version.
 
Run <code>postconf -d | grep mail_version</code> to find out your Postfix version.
−
 
−
 
−
== Log ==
 
−
All mail activity goes to the mail log, and you can see what's going on there:
 
−
<source lang="bash">
 
−
sudo tail -100 /var/log/mail.log
 
−
</source>
 
−
 
−
== Delete Mail ==
 
−
Postfix stores mails in a queue before sending it. Sometimes you wish to remove the mails from the queue but wonder how. Postfix offers the <code>postsuper</code> command which can be used to delete unsent mails from the queue. Before removing the mail from the queue it is good idea to list all mails in the queue. By issuing the command:
 
−
<source lang="bash">
 
−
mailq
 
−
</source>
 
−
you will list all of the mails which are queued or simply timed out for some reason.
 
−
 
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If you want to remove a mail from the "mailq" type:
 
−
<source lang="bash">
 
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postsuper -d mailID
 
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</source>
 
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where mailID is the ID of the message in the mail queue.
 
−
 
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Issuing the command:
 
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<source lang="bash">
 
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postsuper -d ALL
 
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</source>
 
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will delete all queued messages from the mailq.
 
  
 
{{References}}
 
{{References}}
  
 
[[Category:Email]]
 
[[Category:Email]]
−
[[Category:Security]]
 

Revision as of 13:12, 3 March 2016

visit www.postfix.org

Notes on using Postfix [1]. Quick and dirty procedure for setting up Postfix on a new machine that needs email.

Setting up Postfix[edit | edit source]

Add Postfix Mail Transfer Agent as satellite smarthosting through Google, install mail utilities, setup an alias for root's mail and test it all 

  1.  sudo su -

  2.  apt-get install postfix

  3.  apt-get install bsd-mailx
# or 
apt-get install mailutils

  4. cat <<HERE | sudo tee /etc/postfix/main.cf > /dev/null
# work-around for Digital Ocean's blocking of IPv6 for email
smtp_bind_address = 0.0.0.0
# satellite configuration
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous

HERE

  5.  echo "smtp.gmail.com me@example.com:PASSWORD" > /etc/postfix/sasl_passwd

  6.  postmap /etc/postfix/sasl_passwd

  7.  chmod 640 /etc/postfix/sasl_passwd*

  8.  chown postfix:postfix /etc/postfix/sasl_passwd*

  9.  /etc/init.d/postfix restart

  10.  echo "root: me@example.com" >> /etc/aliases && newaliases

  11.  echo test |mail -s "test mail sent to external" greg.rundlett@gmail.com

  12.  echo test |mail -s "test mail sent to root" root


Security[edit | edit source]

https://drownattack.com/postfix.html illustrates how to secure your Postfix installation against weak encryption.

Version[edit | edit source]

Run postconf -d | grep mail_version to find out your Postfix version.

References[edit source]

  1. ↑ loosely following the info at http://braiden.org/?p=15

Internet Protocal version 6

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