diff --git a/config/filter.d/sendmail-reject.conf b/config/filter.d/sendmail-reject.conf
index 7ff9a490..e8b2f9b4 100644
--- a/config/filter.d/sendmail-reject.conf
+++ b/config/filter.d/sendmail-reject.conf
@@ -20,11 +20,11 @@ before = common.conf
 [Definition]
 
 _daemon = (?:(sm-(mta|acceptingconnections)|sendmail))
-__prefix_line = %(known/__prefix_line)s<F-MLFID>(?:\w{14,20}: )?</F-MLFID>
-prefregex = ^%(__prefix_line)s<F-CONTENT>.+</F-CONTENT>$
-
+__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
 addr = (?:(?:IPv6:)?<IP6>|<IP4>)
 
+prefregex = ^\s*(?:<mail\.[^\>]+> )?<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
+
 cmnfailre = ^ruleset=check_rcpt, arg1=(?P<email><\S+@\S+>), relay=(\S+ )?\[%(addr)s\](?: \(may be forged\))?, reject=(?:550 5\.7\.1(?: (?P=email)\.\.\.)?(?: Relaying denied\.)? (?:IP name possibly forged \[(\d+\.){3}\d+\]|Proper authentication required\.|IP name lookup failed \[(\d+\.){3}\d+\]|Fix reverse DNS for \S+)|[45]5[13] [45]\.1\.8(?: (?P=email)\.\.\.)? Domain of sender address \S+ does not (?:exist|resolve)|550 5\.[71]\.1 (?P=email)\.\.\. (Rejected: .*|User unknown))$
             ^ruleset=check_relay(?:, arg\d+=\S*)*, relay=(\S+ )?\[%(addr)s\](?: \(may be forged\))?, reject=421 4\.3\.2 (Connection rate limit exceeded\.|Too many open connections\.)$
             ^rejecting commands from (\S* )?\[%(addr)s\] due to pre-greeting traffic after \d+ seconds$