diff --git a/config/action.d/sendmail-whois-lines.conf b/config/action.d/sendmail-whois-lines.conf
index 0624d592..d1e6e40f 100644
--- a/config/action.d/sendmail-whois-lines.conf
+++ b/config/action.d/sendmail-whois-lines.conf
@@ -12,6 +12,7 @@
 # Values:  CMD
 #
 actionstart = printf %%b "Subject: [Fail2Ban] <name>: started
+              Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
               From: Fail2Ban <<sender>>
               To: <dest>\n
               Hi,\n
@@ -24,6 +25,7 @@ actionstart = printf %%b "Subject: [Fail2Ban] <name>: started
 # Values:  CMD
 #
 actionstop = printf %%b "Subject: [Fail2Ban] <name>: stopped
+             Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
              From: Fail2Ban <<sender>>
              To: <dest>\n
              Hi,\n
@@ -46,6 +48,7 @@ actioncheck =
 # Values:  CMD
 #
 actionban = printf %%b "Subject: [Fail2Ban] <name>: banned <ip>
+            Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
             From: Fail2Ban <<sender>>
             To: <dest>\n
             Hi,\n
diff --git a/config/action.d/sendmail-whois.conf b/config/action.d/sendmail-whois.conf
index d029005c..363c3398 100644
--- a/config/action.d/sendmail-whois.conf
+++ b/config/action.d/sendmail-whois.conf
@@ -12,6 +12,7 @@
 # Values:  CMD
 #
 actionstart = printf %%b "Subject: [Fail2Ban] <name>: started
+              Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
               From: Fail2Ban <<sender>>
               To: <dest>\n
               Hi,\n
@@ -24,6 +25,7 @@ actionstart = printf %%b "Subject: [Fail2Ban] <name>: started
 # Values:  CMD
 #
 actionstop = printf %%b "Subject: [Fail2Ban] <name>: stopped
+             Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
              From: Fail2Ban <<sender>>
              To: <dest>\n
              Hi,\n
@@ -46,6 +48,7 @@ actioncheck =
 # Values:  CMD
 #
 actionban = printf %%b "Subject: [Fail2Ban] <name>: banned <ip>
+            Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
             From: Fail2Ban <<sender>>
             To: <dest>\n
             Hi,\n
diff --git a/config/action.d/sendmail.conf b/config/action.d/sendmail.conf
index e705bb1e..bdc2a3b6 100644
--- a/config/action.d/sendmail.conf
+++ b/config/action.d/sendmail.conf
@@ -12,6 +12,7 @@
 # Values:  CMD
 #
 actionstart = printf %%b "Subject: [Fail2Ban] <name>: started
+              Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
               From: Fail2Ban <<sender>>
               To: <dest>\n
               Hi,\n
@@ -24,6 +25,7 @@ actionstart = printf %%b "Subject: [Fail2Ban] <name>: started
 # Values:  CMD
 #
 actionstop = printf %%b "Subject: [Fail2Ban] <name>: stopped
+             Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
              From: Fail2Ban <<sender>>
              To: <dest>\n
              Hi,\n
@@ -46,6 +48,7 @@ actioncheck =
 # Values:  CMD
 #
 actionban = printf %%b "Subject: [Fail2Ban] <name>: banned <ip>
+            Date: `date -u +"%%a, %%d %%h %%Y %%T +0000"`
             From: Fail2Ban <<sender>>
             To: <dest>\n
             Hi,\n