diff --git a/postfix.grok b/postfix.grok
index c08a66a..fd35e76 100644
--- a/postfix.grok
+++ b/postfix.grok
@@ -27,7 +27,7 @@ POSTFIX_TLSCONN (Anonymous|Trusted|Untrusted|Verified) TLS connection establishe
 POSTFIX_TLSVERIFICATION certificate verification failed for %{POSTFIX_RELAY_INFO}: %{GREEDYDATA:postfix_tls_error}
 
 POSTFIX_DELAYS %{NUMBER:postfix_delay_before_qmgr}/%{NUMBER:postfix_delay_in_qmgr}/%{NUMBER:postfix_delay_conn_setup}/%{NUMBER:postfix_delay_transmission}
-POSTFIX_LOSTCONN (Connection timed out|No route to host|Connection refused|Network is unreachable|lost connection|timeout|SSL_accept error|-1|Address not available|Operation timed out|Address not available|Operation timed out)
+POSTFIX_LOSTCONN (Connection timed out|No route to host|Connection refused|Network is unreachable|lost connection|timeout|SSL_accept error|-1|Address not available|Operation timed out|Address not available|Operation timed out|bare <LF> received)
 POSTFIX_LOSTCONN_REASONS (receiving the initial server greeting|sending message body|sending end of data -- message may be sent more than once|sending %{POSTFIX_SMTP_STAGE:postfix_smtp_stage})
 POSTFIX_PROXY_MESSAGE (%{POSTFIX_STATUS_CODE:postfix_proxy_status_code} )?(%{POSTFIX_STATUS_CODE_ENHANCED:postfix_proxy_status_code_enhanced})?.*
 POSTFIX_COMMAND_COUNTER_DATA (helo=(%{INT:postfix_cmd_helo_accepted}/)?%{INT:postfix_cmd_helo} )?(ehlo=(%{INT:postfix_cmd_ehlo_accepted}/)?%{INT:postfix_cmd_ehlo} )?(starttls=(%{INT:postfix_cmd_starttls_accepted}/)?%{INT:postfix_cmd_starttls} )?(auth=(%{INT:postfix_cmd_auth_accepted}/)?%{INT:postfix_cmd_auth} )?(mail=(%{INT:postfix_cmd_mail_accepted}/)?%{INT:postfix_cmd_mail} )?(rcpt=(%{INT:postfix_cmd_rcpt_accepted}/)?%{INT:postfix_cmd_rcpt} )?(bdat=(%{INT:postfix_cmd_bdat_accepted}/)?%{INT:postfix_cmd_bdat} )?(data=(%{INT:postfix_cmd_data_accepted}/)?%{INT:postfix_cmd_data} )?(rset=(%{INT:postfix_cmd_rset_accepted}/)?%{INT:postfix_cmd_rset} )?(noop=(%{INT:postfix_cmd_noop_accepted}/)?%{INT:postfix_cmd_noop} )?(quit=(%{INT:postfix_cmd_quit_accepted}/)?%{INT:postfix_cmd_quit} )?(unknown=(%{INT:postfix_cmd_unknown_accepted}/)?%{INT:postfix_cmd_unknown} )?commands=(%{INT:postfix_cmd_count_accepted}/)?%{INT:postfix_cmd_count}
diff --git a/test/smtpd_0036.yaml b/test/smtpd_0036.yaml
new file mode 100644
index 0000000..9426412
--- /dev/null
+++ b/test/smtpd_0036.yaml
@@ -0,0 +1,7 @@
+pattern: ^%{POSTFIX_SMTPD}$
+data: "bare <LF> received after CONNECT from example.net[1.2.3.4]"
+results:
+    postfix_smtpd_lostconn_data: bare <LF> received
+    postfix_smtp_stage: CONNECT
+    postfix_client_hostname: example.net
+    postfix_client_ip: 1.2.3.4