diff --git a/config/filter.d/dovecot.conf b/config/filter.d/dovecot.conf
index d4b49576..cf217bcb 100644
--- a/config/filter.d/dovecot.conf
+++ b/config/filter.d/dovecot.conf
@@ -7,12 +7,15 @@ before = common.conf
 
 [Definition]
 
-_daemon = (auth|dovecot(-auth)?|auth-worker)
+_auth_worker = (?:dovecot: )?auth(?:-worker)?
+_daemon = (?:dovecot(?:-auth)?|auth)
 
-failregex = ^%(__prefix_line)s(?:%(__pam_auth)s(?:\(dovecot:auth\))?:)?\s+authentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=<HOST>(?:\s+user=\S*)?\s*$
-            ^%(__prefix_line)s(?:pop3|imap)-login: (?:Info: )?(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth failed, \d+ attempts( in \d+ secs)?|tried to use (disabled|disallowed) \S+ auth)\):( user=<[^>]*>,)?( method=\S+,)? rip=<HOST>(?:, lip=\S+)?(?:, TLS(?: handshaking(?:: SSL_accept\(\) failed: error:[\dA-F]+:SSL routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(, session=<\S+>)?\s*$
-            ^%(__prefix_line)s(?:Info|dovecot: auth\(default\)|auth-worker\(\d+\)): pam\(\S+,<HOST>\): pam_authenticate\(\) failed: (User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\))\s*$
-            ^%(__prefix_line)s(?:auth|auth-worker\(\d+\)): (?:Info: )?[a-z\-]{3,15}\(\S*,<HOST>(?:,\S*)?\): (?:unknown user|invalid credentials)\s*$
+__prefregex = ^%(__prefix_line)s(?:%(_auth_worker)s(?:\([^\)]+\))?: )?(?:%(__pam_auth)s(?:\(dovecot:auth\))?: |(?:pop3|imap)-login: )?(?:Info: )?
+
+failregex = ^%(__prefregex)sauthentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=<HOST>(?:\s+user=\S*)?\s*$
+            ^%(__prefregex)s(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth failed, \d+ attempts(?: in \d+ secs)?|tried to use (?:disabled|disallowed) \S+ auth)\):(?: user=<[^>]*>,)?(?: method=\S+,)? rip=<HOST>(?:[^>]*(?:, session=<\S+>)?)\s*$
+            ^%(__prefregex)spam\(\S+,<HOST>\): pam_authenticate\(\) failed: (?:User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\))\s*$
+            ^%(__prefregex)s[a-z\-]{3,15}\(\S*,<HOST>(?:,\S*)?\): (?:unknown user|invalid credentials)\s*$
 
 ignoreregex = 
 
diff --git a/fail2ban/tests/files/logs/dovecot b/fail2ban/tests/files/logs/dovecot
index 1614ff8c..f564b76e 100644
--- a/fail2ban/tests/files/logs/dovecot
+++ b/fail2ban/tests/files/logs/dovecot
@@ -81,3 +81,6 @@ Mar 23 06:10:52 auth: Info: ldap(dog,52.37.139.121,): invalid credentials
 Jul 26 11:11:21 hostname dovecot: imap-login: Disconnected: Too many invalid commands (tried to use disallowed plaintext auth): user=<test>, rip=192.0.2.1, lip=192.168.1.1, session=<S5dIdTFCDKUWWMbU>
 # failJSON: { "time": "2005-07-26T11:12:19", "match": true , "host": "192.0.2.2" }
 Jul 26 11:12:19 hostname dovecot: imap-login: Disconnected: Too many invalid commands (auth failed, 1 attempts in 17 secs): user=<test>, method=PLAIN, rip=192.0.2.2, lip=192.168.1.1, TLS, session=<g3ZKeDECFqlWWMbU>
+
+# failJSON: { "time": "2004-08-28T06:38:51", "match": true , "host": "192.0.2.3" }
+Aug 28 06:38:51 s166-62-100-187 dovecot: imap-login: Disconnected (auth failed, 1 attempts in 9 secs): user=<administrator@example.com>, method=PLAIN, rip=192.0.2.3, lip=192.168.1.2, TLS: Disconnected, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)