Install and configure Dovecot as the mail delivery agent.Setup Postfix, including making any necessary configuration changes within the appropriate files (such as main.cf).Configure DNS so that the server can receive email.Set up a Linode and implement proper security measures.How to Set Up an Email Server with Postfix, Dovecot and MySQLĬonfiguring an email server using Postfix, Dovecot and MySQL involves the following steps: If you intend to send email from a Compute Instance, review the Send Email on the Linode Platform guide to learn more about our email policies and to request the removal of these restrictions. These restrictions prevent applications from sending email. In that case, it waits up to three times the antispam_sa_waitlimit (* 3) before stepping out of the queue.In an effort to fight spam originating from our platform, outbound connections on ports 25, 465, and 587 are blocked by default on Compute Instances for some new accounts. The message has been put into the wait queue (somewhat commited to wait), but for some reason it takes way more time than expected.That could be reloading of rules or some other unforeseen events. The message is being processed by SpamAssassin which for some reason takes more time than expected.However, in some cases SpamAssassin may still take a bit longer, that is due two possible reasons. ![]() In order to provide a predicable throughput, we have implemented a queue in front of SpamAssassin, and messages are bypassed if the estimated wait time exceeds antispam_sa_waitlimit. Max estimated queue wait time NOT_SCANNED_QUEUE_TOO_LONG=0 is returned if exceeded Max message size NOT_SCANNED_TOO_BIG=0 is returned if exceeded High volume systems need to cope with this fact, and for that reason we have developed a queuing and bypass system. SpamAssassin has several "deep scanning" and network lookup filters, that may take some time depending on the size, content, complexity and layout of a message. Or you can block them based on domain name using dns_query_restriction deny ĭns_query_restriction deny Performanceīefore reading this chapter, please familiarise yourself with the general performance guidelines. To your configuration, or disabling some of them by adding lines such as score _RCVD_IN_ZEN 0 # SpamHaus If you have a very high traffic system which is likely to be blocked by all SpamAssassin's included DNSBL lists, you can disable all of them by adding skip_rbl_checks 1 However, your system's accuracy or performance shouldn't be significantly degraded if some of those DNSBL's start blocking you. Some of them might, or might not, be free for you to use. SpamAssassin has strict policy for which DNSBL lists to include by default. If (ScanSA() >= 5) Reject("Rejected by spam filter (".$transaction.")") DNSBL usage If (ScanRPD() = 10 and ScanSA() >= 3) Reject("Rejected by spam filter (".$transaction.")") ![]() If (ScanRPD() = 50 and ScanSA() >= 2) Reject("Rejected by spam filter (".$transaction.")") if (ScanRPD() = 100) Reject("Rejected by spam filter (".$transaction.")") if (ScanSA() >= 5) Reject("Rejected by spam filter (".$transaction.")") Īnd to combine it with Cyren's RPD engine you can call on the ScanSA() function for all classifications other than "spam" (100). SpamAssassin can be invoked by using the built-in ScanSA() function in the EOD context. Score RDNS_NONE 0 # We don't do reverse lookups for performance reasons Use_bayes 0 # Faster Bayes database (lines below)īayes_path /storage/spamassassin/bayesian/bayesīayes_store_module Mail::SpamAssassin::BayesStore::SDBM Lock_method flock # Faster locking method It's possible to add your own rules on the Configuration -> Anti-spam/virus -> SpamAssassin page (the configuration key antispam_sa_config). Rules are updated through SpamAssassin's own channel. Bayesian is disabled because our standard configuration doesn't run SpamAssassin on messages with a CYREN "spam" classification.įor information on what rules are included by default, please see SpamAssassin's official default rules page. The integrated package ship's with SpamAssassin's default configuration, with the exceptions list below.
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