diff --git a/config/filter.d/exim.conf b/config/filter.d/exim.conf
index 511f30b8..2c4a516b 100644
--- a/config/filter.d/exim.conf
+++ b/config/filter.d/exim.conf
@@ -14,7 +14,7 @@
 # Values:  TEXT
 #
 failregex = \[<HOST>\] .*(?:rejected by local_scan|Unrouteable address)
-             ^ login authenticator failed for ([^\s\(]+\s)?\([^)]*\) \[<HOST>\]: 535 Incorrect authentication data( \(set_id=.*\)|: \d+ Time\(s\))\s*$
+             ^ login authenticator failed for (\S+ )?\(\S+\) \[<HOST>\]: 535 Incorrect authentication data( \(set_id=.*\)|: \d+ Time\(s\))\s*$
 
 # Option:  ignoreregex
 # Notes.:  regex to ignore. If this regex matches, the line is ignored.