diff --git a/modoboa_installer/scripts/dovecot.py b/modoboa_installer/scripts/dovecot.py
index eb3d4a3..02fece5 100644
--- a/modoboa_installer/scripts/dovecot.py
+++ b/modoboa_installer/scripts/dovecot.py
@@ -4,7 +4,6 @@ import glob
 import os
 import pwd
 import shutil
-import uuid
 
 from .. import database
 from .. import package
@@ -15,6 +14,7 @@ from . import base
 
 
 class Dovecot(base.Installer):
+
     """Dovecot installer."""
 
     appname = "dovecot"
@@ -27,9 +27,8 @@ class Dovecot(base.Installer):
     }
     config_files = [
         "dovecot.conf", "dovecot-dict-sql.conf.ext", "conf.d/10-ssl.conf",
-        "conf.d/10-master.conf", "conf.d/20-lmtp.conf", "conf.d/10-ssl-keys.try",
-        "conf.d/dovecot-oauth2.conf.ext"
-    ]
+        "conf.d/10-master.conf", "conf.d/20-lmtp.conf",
+        "conf.d/10-ssl-keys.try", "conf.d/90-sieve.conf"]
     with_user = True
 
     def setup_user(self):
@@ -43,8 +42,7 @@ class Dovecot(base.Installer):
         _config_files = self.config_files
 
         if self.app_config["move_spam_to_junk"]:
-            _config_files += ["conf.d/90-sieve.conf",
-                              "conf.d/custom_after_sieve/spam-to-junk.sieve"]
+            _config_files += ["conf.d/custom_after_sieve/spam-to-junk.sieve"]
 
         return _config_files + [
             "dovecot-sql-{}.conf.ext=dovecot-sql.conf.ext"
@@ -80,7 +78,7 @@ class Dovecot(base.Installer):
 
     def get_template_context(self):
         """Additional variables."""
-        context = super().get_template_context()
+        context = super(Dovecot, self).get_template_context()
         pw_mailbox = pwd.getpwnam(self.mailboxes_owner)
         dovecot_package = {"deb": "dovecot-core", "rpm": "dovecot"}
         ssl_protocol_parameter = "ssl_protocols"
@@ -122,8 +120,7 @@ class Dovecot(base.Installer):
             "ssl_protocols": ssl_protocols,
             "ssl_protocol_parameter": ssl_protocol_parameter,
             "modoboa_2_2_or_greater": "" if self.modoboa_2_2_or_greater else "#",
-            "not_modoboa_2_2_or_greater": "" if not self.modoboa_2_2_or_greater else "#",
-            "oauth2_introspection_url": oauth2_introspection_url
+            "not_modoboa_2_2_or_greater": "" if not self.modoboa_2_2_or_greater else "#"
         })
         return context
 
@@ -153,7 +150,7 @@ class Dovecot(base.Installer):
         # See https://github.com/modoboa/modoboa/issues/2157.
         if self.app_config["move_spam_to_junk"]:
             # Compile sieve script
-            sieve_file = "/etc/dovecot/conf.d/custom_after_sieve/spam-to-junk.sieve"
+            sieve_file = f"{self.config_dir}/conf.d/custom_after_sieve/spam-to-junk.sieve"
             utils.exec_cmd(f"/usr/bin/sievec {sieve_file}")
         system.add_user_to_group(self.mailboxes_owner, 'dovecot')
 
diff --git a/modoboa_installer/scripts/files/dovecot/conf.d/90-sieve.conf b/modoboa_installer/scripts/files/dovecot/conf.d/90-sieve.conf.tpl
similarity index 100%
rename from modoboa_installer/scripts/files/dovecot/conf.d/90-sieve.conf
rename to modoboa_installer/scripts/files/dovecot/conf.d/90-sieve.conf.tpl