diff --git a/ChangeLog.md b/ChangeLog.md
index 4c5cc80..a8135ad 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -5,6 +5,11 @@ repository history](https://github.com/ddclient/ddclient/commits/main).
 
 ## v4.0.0-rc.2 (unreleased work-in-progress)
 
+### New features
+
+  * New `--mail-from` option to control the "From:" header of email messages.
+    [#565](https://github.com/ddclient/ddclient/pull/565)
+
 ## 2024-12-25 v4.0.0-rc.1
 
 ### Breaking changes
diff --git a/ddclient.conf.in b/ddclient.conf.in
index dd4189e..62a7ee9 100644
--- a/ddclient.conf.in
+++ b/ddclient.conf.in
@@ -25,6 +25,9 @@ daemon=300                      # check every 300 seconds
 syslog=yes                      # log update msgs to syslog
 mail=root                       # mail all msgs to root
 mail-failure=root               # mail failed update msgs to root
+# mail-from=root                # set the email "From:" header to "root".  If
+                                # unset (the default) or empty, the from address
+                                # depends on your system's default behavior.
 pid=@runstatedir@/ddclient.pid  # record PID in file.
 # postscript=script             # run script after updating.  The new IP is
                                 # added as argument.
diff --git a/ddclient.in b/ddclient.in
index b37eed3..ebd0e71 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -704,6 +704,7 @@ our %cfgvars = (
         'priority'            => setv(T_STRING,0, 'notice',             undef),
         'mail'                => setv(T_EMAIL, 0, undef,                undef),
         'mail-failure'        => setv(T_EMAIL, 0, undef,                undef),
+        'mail-from'           => setv(T_EMAIL, 0, undef,                undef),
         'max-warn'            => setv(T_NUMBER,0, 1,                    undef),
 
         'exec'                => setv(T_BOOL,  0, 1,                    undef),
@@ -1427,6 +1428,7 @@ my @opt = (
     ["max-warn",          "=i", "--max-warn=<max>       : log at most <max> warning messages for undefined IP address"],
     ["mail",              "=s", "--mail=<address>       : e-mail messages to <address>"],
     ["mail-failure",      "=s", "--mail-failure=<addr>  : e-mail messages for failed updates to <addr>"],
+    ["mail-from",         "=s", '--mail-from=<addr>     : set the "From:" header in e-mail messages to <addr> if non-empty'],
     ["exec",              "!",  "--{no}exec             : do {not} execute; just show what would be done"],
     ["debug",             "!",  "--{no}debug            : print {no} debugging information"],
     ["verbose",           "!",  "--{no}verbose          : print {no} verbose information"],
@@ -2404,8 +2406,10 @@ sub sendmail {
         $recipients = opt('mail-failure');
     }
     if ($emailbody && $recipients && $emailbody ne $last_emailbody) {
+        my $sender = opt('mail-from') // '';
         pipecmd("sendmail -oi $recipients",
                 "To: $recipients",
+                $sender ne '' ? ("From: $sender") : (),
                 "Subject: status report from $program\@$hostname",
                 "\r\n",
                 $emailbody,