setup_basic_mailserver_with_postfix_dovecot_sieve

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setup_basic_mailserver_with_postfix_dovecot_sieve [02.01.2020 09:01] – [future improvements] Pascal Sutersetup_basic_mailserver_with_postfix_dovecot_sieve [02.01.2020 11:57] – [proxmox mail gateway] Pascal Suter
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   * once all these settings where done, i had to login to the filter via ssh and **manually restart postfix**. otherwise postfix would bind port 25 to 127.0.0.1 only. i guess rebooting the entire filter would fix this issue as well.   * once all these settings where done, i had to login to the filter via ssh and **manually restart postfix**. otherwise postfix would bind port 25 to 127.0.0.1 only. i guess rebooting the entire filter would fix this issue as well.
  
-==== future improvements ==== +==== tag and deliver spam instead of quarantine ==== 
-=== Bayesian learning by moving mail to junk folder === +I'm not sure I or my users would be happy with waiting for reports to find out why a recently sent mail did not reach them. after all it'always a good feeling if you can tell someone on the phone that you didn't find their email in your spam folder either, to convince them that they might have had a typo in your email address :) .. 
-in order for proxmox'Bayesian filter to learn and start working you need to provide spam and ham mails. to do this, one needs to copy spam that passed the filter to a temporary location on the proxmox mail gateway and then tell the Bayesian filter that this is spam. it needs at least 200 spam and ham mails to start working. ideallywe should be able to do this by simply moving an email to the spam folder on our imap account and the email should then be submitted to the bayesian filter of PMG automatically.. +
  
-some information i will need to do this:  +First you need to make sure that spam is no longer quarantined but instead marked and forwarded
-  * the command on PMG to submit a ham or spam to the learning system is <code>sa-learn --spam filename</code> +
-  * a solution on how to use imap sieve filters to trigger a bash script when a mail is moved into a specific folder can be found in the [[https://workaround.org/ispmail/buster/filtering-out-spam-with-rspamd-2/|all mighty ISPmail tutorial]]+
  
-=== tag and deliver spam instead of quarantine === +you can either mark an email by modifying its subject or by adding header element.i don't like changing the visible part of the email messageso i opted to go for an additional header field that marks spam
-I'm not sure I or my users would be happy with waiting for reports to find out why recently sent mail did not reach themafter all it's always a good feeling if you can tell someone on the phone that you didn't find their email in your spam folder either, to convince them that they might have had a typo in your email address :) .+
  
-i've started this alreadyFirst you need to make sure that spam is no longer quarantined but instead marked and forwarded+to create it, go to the ''Mail Filter-->Action Objects'' page in the PMG web-interface and add a new action object of the ''Header Attribute'' typestart the header atribute with ''x-'' and choose something meaningful.. i went for ''x-spam-mail:yes'' 
  
-in the PMG web interface click on ''Mail Filter'' in the left column. you will now see a list of all active or inactive mail filters. by selecting a filter, you can then see on the right hand side column which actions will be executed. you can simply remove the Quarantine action from the active ones and then drag and drop the "Modify subject" up to activate it. +next we need to make sure that all spam mail is tagged with this header field instead of quarantined.   
 + 
 +in the PMG web interface click on ''Mail Filter'' in the left column. you will now see a list of all active or inactive mail filters. by selecting a filter, you can then see on the right hand side column which actions will be executed. you can simply remove the Quarantine action from the active ones and then drag and drop the newly created action object to the active actions or click the + sign to add it. 
  
 now on to your postfix mail server.. we need to add a global sieve rule to dovecot that will move spam into a spam folder.. edit ''/etc/dovecot/conf.d/90-sieve.conf'' and look for "sieve_after" templates.. add a new line after those that looks like this:  now on to your postfix mail server.. we need to add a global sieve rule to dovecot that will move spam into a spam folder.. edit ''/etc/dovecot/conf.d/90-sieve.conf'' and look for "sieve_after" templates.. add a new line after those that looks like this: 
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 require ["fileinto","mailbox"]; require ["fileinto","mailbox"];
  
-if header :contains "X-SPAM-LEVEL" {+if header :contains "x-spam-mail" "yes" {
  fileinto :create "INBOX.Junk";  fileinto :create "INBOX.Junk";
  stop;  stop;
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 EOF EOF
 </code> </code>
-** this filter won't compile.. i need to fix this!** 
 now compile the sieve filter:  now compile the sieve filter: 
   sievec /etc/dovecot/sieve-after/spam-to-folder.sieve   sievec /etc/dovecot/sieve-after/spam-to-folder.sieve
 +lastly restart dovecot to re-read the config we altered bove 
 +  systemctl restart dovecot 
 +to test, send an email from outside to your mail account with the following line in the body: 
 +<code>
 +XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X
 +</code>
 +
 +==== future improvements ====
 +=== Bayesian learning by moving mail to junk folder ===
 +in order for proxmox's Bayesian filter to learn and start working you need to provide spam and ham mails. to do this, one needs to copy spam that passed the filter to a temporary location on the proxmox mail gateway and then tell the Bayesian filter that this is spam. it needs at least 200 spam and ham mails to start working. ideally, we should be able to do this by simply moving an email to the spam folder on our imap account and the email should then be submitted to the bayesian filter of PMG automatically.. 
 +
 +some information i will need to do this: 
 +  * the command on PMG to submit a ham or spam to the learning system is <code>sa-learn --spam filename</code>
 +  * a solution on how to use imap sieve filters to trigger a bash script when a mail is moved into a specific folder can be found in the [[https://workaround.org/ispmail/buster/filtering-out-spam-with-rspamd-2/|all mighty ISPmail tutorial]]
 +
  
 ==== adjustments to postfix settings on our mailserver ==== ==== adjustments to postfix settings on our mailserver ====
  • setup_basic_mailserver_with_postfix_dovecot_sieve.txt
  • Last modified: 20.03.2021 07:47
  • by Pascal Suter