diff --git a/htdocs/core/class/html.formticket.class.php b/htdocs/core/class/html.formticket.class.php
index 9e00fc35f907f..d2dde32ce692e 100644
--- a/htdocs/core/class/html.formticket.class.php
+++ b/htdocs/core/class/html.formticket.class.php
@@ -1697,53 +1697,102 @@ public function showMessageForm($width = '40%')
 			print '</td></tr>';
 
 			// Recipients / adressed-to
-			print '<tr class="email_line"><td>'.$langs->trans('MailRecipients');
-			print ' '.$form->textwithpicto('', $langs->trans("TicketMessageRecipientsHelp"), 1, 'help');
+			// @ATM-PATCH BEGIN ticket-editable-recipients — editable TO/CC recipient fields, backport of Dolibarr core PR #38391 (adapted to 21.0)
+			// grep: git grep '@ATM-PATCH' -- htdocs/
+			print '<tr class="email_line"><td class="fieldrequired">'.$langs->trans('MailRecipients');
+			print ' '.$form->textwithpicto('', $langs->trans("YouCanUseCommaSeparatorForSeveralRecipients"), 1, 'help');
 			print '</td><td>';
+			$withto = array();
 			if ($res) {
-				// Retrieve email of all contacts (internal and external)
+				$sendto_free = GETPOSTISSET('sendto') ? GETPOST('sendto', 'alphawithlgt') : '';
+				print '<input class="minwidth200" id="sendto" name="sendto" spellcheck="false" placeholder="email@domain.com" value="'.dol_escape_htmltag($sendto_free).'" />';
+
+				// Build recipient list; keys are email addresses (used directly in newMessage())
 				$contacts = $ticketstat->getInfosTicketInternalContact(1);
 				$contacts = array_merge($contacts, $ticketstat->getInfosTicketExternalContact(1));
+				$seen_emails = array();
 
-				$sendto = array();
-
-				// Build array to display recipient list
 				if (is_array($contacts) && count($contacts) > 0) {
-					foreach ($contacts as $key => $info_sendto) {
+					foreach ($contacts as $info_sendto) {
 						if ($info_sendto['email'] != '') {
-							$sendto[] = dol_escape_htmltag(trim($info_sendto['firstname']." ".$info_sendto['lastname'])." <".$info_sendto['email'].">").' <small class="opacitymedium">('.dol_escape_htmltag($info_sendto['libelle']).")</small>";
+							$email_lc = strtolower($info_sendto['email']);
+							if (!in_array($email_lc, $seen_emails)) {
+								$label_text = trim($info_sendto['firstname'].' '.$info_sendto['lastname']).' <'.$info_sendto['email'].'>';
+								$label_html = dol_htmlentities(trim($info_sendto['firstname'].' '.$info_sendto['lastname']), ENT_QUOTES, 'UTF-8')
+									.' <span class="opacitymedium">('.dol_htmlentities($info_sendto['libelle'], ENT_QUOTES, 'UTF-8').')</span>';
+								$withto[$info_sendto['email']] = array(
+									'id'        => $info_sendto['email'],
+									'label'     => str_replace(array('<', '>'), array('(', ')'), $label_text),
+									'labelhtml' => $label_html,
+								);
+								$seen_emails[] = $email_lc;
+							}
 						}
 					}
 				}
 
-				if (!empty($ticketstat->origin_replyto) && !in_array($ticketstat->origin_replyto, $sendto)) {
-					$sendto[] = dol_escape_htmltag($ticketstat->origin_replyto).' <small class="opacitymedium">('.$langs->trans("TicketEmailOriginIssuer").")</small>";
-				} elseif ($ticketstat->origin_email && !in_array($ticketstat->origin_email, $sendto)) {
-					$sendto[] = dol_escape_htmltag($ticketstat->origin_email).' <small class="opacitymedium">('.$langs->trans("TicketEmailOriginIssuer").")</small>";
+				if (!empty($ticketstat->origin_replyto) && !in_array(strtolower($ticketstat->origin_replyto), $seen_emails)) {
+					$email = (string) $ticketstat->origin_replyto;
+					$withto[$email] = array('id' => $email, 'label' => $email, 'labelhtml' => dol_escape_htmltag($email).' <span class="opacitymedium">('.$langs->trans('TicketEmailOriginIssuer').')</span>');
+					$seen_emails[] = strtolower($email);
+				} elseif ($ticketstat->origin_email && !in_array(strtolower((string) $ticketstat->origin_email), $seen_emails)) {
+					$email = (string) $ticketstat->origin_email;
+					$withto[$email] = array('id' => $email, 'label' => $email, 'labelhtml' => dol_escape_htmltag($email).' <span class="opacitymedium">('.$langs->trans('TicketEmailOriginIssuer').')</span>');
+					$seen_emails[] = strtolower($email);
 				}
 
 				if ($ticketstat->fk_soc > 0) {
 					$ticketstat->socid = $ticketstat->fk_soc;
 					$ticketstat->fetch_thirdparty();
+					if (!empty($ticketstat->thirdparty->email) && !in_array(strtolower((string) $ticketstat->thirdparty->email), $seen_emails)) {
+						$email = (string) $ticketstat->thirdparty->email;
+						$withto[$email] = array('id' => $email, 'label' => $email, 'labelhtml' => dol_escape_htmltag($email).' <span class="opacitymedium">('.$langs->trans('Customer').')</span>');
+						$seen_emails[] = strtolower($email);
+					}
+				}
 
-					if (!empty($ticketstat->thirdparty->email) && !in_array($ticketstat->thirdparty->email, $sendto)) {
-						$sendto[] = $ticketstat->thirdparty->email.' <small class="opacitymedium">('.$langs->trans('Customer').')</small>';
+				if (getDolGlobalInt('TICKET_NOTIFICATION_ALSO_MAIN_ADDRESS') && getDolGlobalString('TICKET_NOTIFICATION_EMAIL_TO')) {
+					$generic_email = getDolGlobalString('TICKET_NOTIFICATION_EMAIL_TO');
+					if (!in_array(strtolower($generic_email), $seen_emails)) {
+						$withto[$generic_email] = array('id' => $generic_email, 'label' => $generic_email, 'labelhtml' => dol_escape_htmltag($generic_email).' <span class="opacitymedium">(generic)</span>');
 					}
 				}
 
-				if (getDolGlobalInt('TICKET_NOTIFICATION_ALSO_MAIN_ADDRESS')) {
-					$sendto[] = getDolGlobalString('TICKET_NOTIFICATION_EMAIL_TO').' <small class="opacitymedium">(generic email)</small>';
+				// Preselect all contacts on first load; restore POST selection on re-display
+				if (GETPOSTISSET('receiver_multiselect')) {
+					$withtoselected = GETPOST('receiver', 'array');
+				} else {
+					$withtoselected = array_keys($withto);
 				}
 
-				// Print recipient list
-				if (is_array($sendto) && count($sendto) > 0) {
-					print img_picto('', 'email', 'class="pictofixedwidth"');
-					print implode(', ', $sendto);
+				if (!empty($withto)) {
+					print ' <span class="opacitymedium">'.$langs->trans("and").'/'.$langs->trans("or").'</span> ';
+					print $form->multiselectarray('receiver', $withto, $withtoselected, 0, 0, 'inline-block minwidth500', 0, 0, '', '', '', 1);
 				} else {
-					print '<div class="warning">'.$langs->trans('WarningNoEMailsAdded').' '.$langs->trans('TicketGoIntoContactTab').'</div>';
+					// No contact linked: emit the flag hidden so newMessage() still reads the free sendto input
+					print '<input type="hidden" name="receiver_multiselect" value="1">';
+					print ' &nbsp;<span class="opacitymedium"><small>'.$langs->trans('WarningNoEMailsAdded').'</small></span>';
 				}
 			}
 			print '</td></tr>';
+
+			// CC field: free input + multiselect of the same contact list, nothing preselected
+			print '<tr class="email_line"><td>';
+			print $form->textwithpicto($langs->trans("MailCC"), $langs->trans("YouCanUseCommaSeparatorForSeveralRecipients"), 1, 'help');
+			print '</td><td>';
+			if (GETPOSTISSET('receivercc_multiselect')) {
+				$sendtocc_free = GETPOST('sendtocc', 'alphawithlgt');
+			} else {
+				$sendtocc_free = getDolGlobalString('TICKET_SEND_INTERNAL_CC');
+			}
+			print '<input class="minwidth200" id="sendtocc" name="sendtocc" spellcheck="false" value="'.dol_escape_htmltag($sendtocc_free).'" />';
+			if (!empty($withto)) {
+				print ' <span class="opacitymedium">'.$langs->trans("and").'/'.$langs->trans("or").'</span> ';
+				$withtocc_selected = GETPOSTISSET('receivercc_multiselect') ? GETPOST('receivercc', 'array') : array();
+				print $form->multiselectarray('receivercc', $withto, $withtocc_selected, 0, 0, 'inline-block minwidth500', 0, 0, '', '', '', 1);
+			}
+			print '</td></tr>';
+			// @ATM-PATCH END ticket-editable-recipients
 		}
 
 		$uselocalbrowser = false;
@@ -1833,6 +1882,12 @@ public function showMessageForm($width = '40%')
 			// Clean first \n and br (to avoid empty line when CONTACTCIVNAME is empty)
 			$defaultmessage = preg_replace("/^(<br>)+/", "", $defaultmessage);
 			$defaultmessage = preg_replace("/^\n+/", "", $defaultmessage);
+			// @ATM-PATCH BEGIN ticket-private-empty-compose — a private ticket message opens with an empty compose field (was prefilled with the template/personal signature); an email message keeps the template, the outgoing signature is still appended at send time
+			// grep: git grep '@ATM-PATCH' -- htdocs/
+			if (empty($send_email)) {
+				$defaultmessage = '';
+			}
+			// @ATM-PATCH END ticket-private-empty-compose
 		}
 
 		print '<tr><td colspan="2"><label for="message"><span class="fieldrequired">'.$langs->trans("Message").'</span>';
diff --git a/htdocs/ticket/class/ticket.class.php b/htdocs/ticket/class/ticket.class.php
index bc72624655715..bcf67554a136b 100644
--- a/htdocs/ticket/class/ticket.class.php
+++ b/htdocs/ticket/class/ticket.class.php
@@ -3023,9 +3023,79 @@ public function newMessage($user, &$action, $private = 1, $public_area = 0)
 									}
 								}
 
+								// @ATM-PATCH BEGIN ticket-editable-recipients — when the standardised send form is used (PR #38391 backport), replace auto-computed recipients with the user selection and add the CC list
+								// grep: git grep '@ATM-PATCH' -- htdocs/
+								$sendtocc_form = '';
+								if (GETPOSTISSET('receiver_multiselect')) {
+									$sendto = array();
+									$receiver_selected = GETPOST('receiver', 'array');
+									if (is_array($receiver_selected)) {
+										foreach ($receiver_selected as $email) {
+											$email = trim((string) $email);
+											if ($email && filter_var($email, FILTER_VALIDATE_EMAIL)) {
+												$sendto[$email] = $email;
+											}
+										}
+									}
+									// Free input: plain email or "Name <email>", comma-separated
+									$sendto_free = GETPOST('sendto', 'alphawithlgt');
+									if ($sendto_free !== '') {
+										foreach (explode(',', $sendto_free) as $entry) {
+											$entry = trim($entry);
+											if ($entry === '') {
+												continue;
+											}
+											if (preg_match('/.*<\s*([^>]+)\s*>/', $entry, $matches)) {
+												$email = trim($matches[1]);
+											} else {
+												$email = $entry;
+											}
+											if ($email && filter_var($email, FILTER_VALIDATE_EMAIL)) {
+												$sendto[$email] = $entry;
+											}
+										}
+									}
+
+									// CC list built from the form (multiselect + free input), case-insensitive dedup
+									$sendtocc_list = array();
+									$sendtocc_seen = array();
+									if (GETPOSTISSET('receivercc_multiselect')) {
+										$receivercc_selected = GETPOST('receivercc', 'array');
+										if (is_array($receivercc_selected)) {
+											foreach ($receivercc_selected as $email) {
+												$email = trim((string) $email);
+												if ($email && filter_var($email, FILTER_VALIDATE_EMAIL) && !in_array(strtolower($email), $sendtocc_seen)) {
+													$sendtocc_list[] = $email;
+													$sendtocc_seen[] = strtolower($email);
+												}
+											}
+										}
+									}
+									$sendtocc_free = GETPOST('sendtocc', 'alphawithlgt');
+									if ($sendtocc_free !== '') {
+										foreach (explode(',', $sendtocc_free) as $entry) {
+											$entry = trim($entry);
+											if ($entry === '') {
+												continue;
+											}
+											if (preg_match('/.*<\s*([^>]+)\s*>/', $entry, $matches)) {
+												$email = trim($matches[1]);
+											} else {
+												$email = $entry;
+											}
+											if ($email && filter_var($email, FILTER_VALIDATE_EMAIL) && !in_array(strtolower($email), $sendtocc_seen)) {
+												$sendtocc_list[] = $entry;
+												$sendtocc_seen[] = strtolower($email);
+											}
+										}
+									}
+									$sendtocc_form = implode(',', $sendtocc_list);
+								}
+								// @ATM-PATCH END ticket-editable-recipients
+
 								// Don't try to send email when no recipient
 								if (!empty($sendto)) {
-									$result = $this->sendTicketMessageByEmail($subject, $message, 0, $sendto, $listofpaths, $listofmimes, $listofnames);
+									$result = $this->sendTicketMessageByEmail($subject, $message, 0, $sendto, $listofpaths, $listofmimes, $listofnames, $sendtocc_form);
 									if ($result) {
 										// update last_msg_sent date (for last message sent to external users)
 										$this->date_last_msg_sent = dol_now();
@@ -3092,7 +3162,7 @@ protected function applyMailSubstitutions($content, $langs, $object = null)
 	 * @param string[]	$mimefilename_list   List of attached file name in message
 	 * @return boolean     					True if mail sent to at least one receiver, false otherwise
 	 */
-	public function sendTicketMessageByEmail($subject, $message, $send_internal_cc = 0, $array_receiver = array(), $filename_list = array(), $mimetype_list = array(), $mimefilename_list = array())
+	public function sendTicketMessageByEmail($subject, $message, $send_internal_cc = 0, $array_receiver = array(), $filename_list = array(), $mimetype_list = array(), $mimefilename_list = array(), $sendtocc_extra = '')
 	{
 		global $conf, $langs, $user;
 
@@ -3116,6 +3186,12 @@ public function sendTicketMessageByEmail($subject, $message, $send_internal_cc =
 		if ($send_internal_cc) {
 			$sendtocc = getDolGlobalString('TICKET_NOTIFICATION_EMAIL_FROM');
 		}
+		// @ATM-PATCH BEGIN ticket-editable-recipients — allow an explicit CC list (from the standardised send form, PR #38391 backport) in addition to the internal CC
+		// grep: git grep '@ATM-PATCH' -- htdocs/
+		if (!empty($sendtocc_extra)) {
+			$sendtocc = ($sendtocc !== '' ? $sendtocc.',' : '').$sendtocc_extra;
+		}
+		// @ATM-PATCH END ticket-editable-recipients
 
 		$from = getDolGlobalString('TICKET_NOTIFICATION_EMAIL_FROM');
 		$is_sent = false;