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--- doc:appunti:linux:sa:postfix_spamassassin_clamav_dovecot [2023/02/28 12:43] – [Enable sieve_extprograms plugin] niccolo
+++ doc:appunti:linux:sa:postfix_spamassassin_clamav_dovecot [2026/06/09 10:33] (current) – [Postfix, SpamAssassin, ClamAV and Dovecot] niccolo
@@ Line 2: / Line 2: @@
 Tested on **Debian 9 Stretch**.
+:!: **WARNING**: The configuration of **Dovecot 2.2.27** (Debian 9 Stretch) is still valid in Dovecot 2.3.19 (Debian 12 Bookworm), but **it changes in Dovecot 2.4.1** (Debian 13 Trixie), requiring several **changes to the configuration files**. You can find some of the adjustments required in this page: **[[debian_upgrade_12_13#dovecot|Aggiornamento da Debian 12 a 13: Dovecot]]**.
 ===== Postfix on Port 587/TCP (submission) =====
@@ Line 176: / Line 178: @@
 Once restarted the **dovecot.service**, we will find the services listening on the well known ports, and we can check the SSL certificates.
+==== Client connections are being dropped ====
+You may encounter wanring messages like these into the mail log:
+<code>
+dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped
+</code>
+To increase the number of process that are allowed to spawn, edit the **/etc/dovecot/conf.d/10-master.conf** file and set
+<file>
+default_process_limit = 200
+</file>
 ===== SpamAssassin Filter =====
@@ Line 318: / Line 335: @@
 </code>
-There was a problem with **the filter program responding too slowly**. It is possible to change the **exec timeout**, in this case for the **filter** extension, just add the following in **/etc/dovecot/conf.d/90-sieve-extprograms.conf**:
+There was a problem with **the filter program responding too slowly**. It is possible to change the **exec timeout**, in this case for the **filter** extension, just add the following in **/etc/dovecot/conf.d/90-sieve-extprograms.conf** (notice that you can configure ''sieve_pipe_exec_timeout'', ''sieve_filter_exec_timeout'' and ''sieve_execute_exec_timeout''):
 <file>
@@ Line 325: / Line 342: @@
   # Change the default timeout (10 seconds) for the filter extension.
   sieve_filter_exec_timeout = 60s
+  # Change the default timeout (10 seconds) for the execute extension.
+  sieve_execute_exec_timeout = 60s
 }
 </file>