diff --git a/app/config/mail.conf.dist.php b/app/config/mail.conf.dist.php
index 7724e931ec..6ba16009a8 100644
--- a/app/config/mail.conf.dist.php
+++ b/app/config/mail.conf.dist.php
@@ -18,3 +18,4 @@ $platform_email['SMTP_CHARSET'] = 'UTF-8';
 $platform_email['SMTP_UNIQUE_SENDER'] = 0; // to send all mails from the same user
 $platform_email['SMTP_DEBUG'] = 0; // change to 1 to enable smtp debug
 $platform_email['SMTP_SECURE'] = 'tls'; // if you're using SSL: ssl; or TLS: tls. (only used if SMTP_AUTH==1)
+$platform_email['SMTP_UNIQUE_REPLY_TO'] = 0; // to use AWS SMS service, SMTP_UNIQUE_SENDER and this have to be = 1
diff --git a/main/inc/lib/api.lib.php b/main/inc/lib/api.lib.php
index 0b71b01de2..99bd983462 100644
--- a/main/inc/lib/api.lib.php
+++ b/main/inc/lib/api.lib.php
@@ -7783,7 +7783,7 @@ function api_mail_html(
     $senderEmail = !empty($senderEmail) ? $senderEmail : $defaultEmail;
 
     // Reply to first
-    if (isset($extra_headers['reply_to'])) {
+    if (isset($extra_headers['reply_to']) && empty($platform_email['SMTP_UNIQUE_REPLY_TO'])) {
         $mail->AddReplyTo(
             $extra_headers['reply_to']['mail'],
             $extra_headers['reply_to']['name']