diff --git a/application/Espo/Core/Mail/Sender.php b/application/Espo/Core/Mail/Sender.php
index af180a20b8..a43d4d1fe9 100644
--- a/application/Espo/Core/Mail/Sender.php
+++ b/application/Espo/Core/Mail/Sender.php
@@ -191,12 +191,17 @@ class Sender
 
 		$body = new MimeMessage;
 		$parts = array();
-
-		$bodyPart = new MimePart($email->get('body'));
+		
 
 		if ($email->get('isHtml')) {
+			$bodyPart = new MimePart($email->get('body'));
 			$bodyPart->type = 'text/html';
-		} else {
+		} else {			
+			if ($email->get('bodyPlain')) {
+				$bodyPart = new MimePart($email->get('bodyPlain'));
+			} else {
+				$bodyPart = new MimePart($email->get('body'));
+			}
 			$bodyPart->type = 'text/plain';
 		}
 
diff --git a/application/Espo/Entities/Preferences.php b/application/Espo/Entities/Preferences.php
index cd79b5165f..0afa6d4049 100644
--- a/application/Espo/Entities/Preferences.php
+++ b/application/Espo/Entities/Preferences.php
@@ -18,7 +18,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
- ************************************************************************/ 
+ ************************************************************************/
 
 namespace Espo\Entities;
 
@@ -27,11 +27,11 @@ class Preferences extends \Espo\Core\ORM\Entity
 
 	public function getSmtpParams()
 	{
-		$smtpParams = array();				
+		$smtpParams = array();
 		$smtpParams['server'] = $this->get('smtpServer');
 		if ($smtpParams['server']) {
 			$smtpParams['port'] = $this->get('smtpPort');
-			$smtpParams['server'] = $this->get('smtpServer');	
+			$smtpParams['server'] = $this->get('smtpServer');
 			$smtpParams['auth'] = $this->get('smtpAuth');
 			$smtpParams['security'] = $this->get('smtpSecurity');
 			$smtpParams['username'] = $this->get('smtpUsername');
@@ -40,7 +40,6 @@ class Preferences extends \Espo\Core\ORM\Entity
 		} else {
 			return false;
 		}
-	}	
-	
+	}
 }
 
diff --git a/application/Espo/Modules/Crm/Controllers/Call.php b/application/Espo/Modules/Crm/Controllers/Call.php
index e83b989507..d664c225e6 100644
--- a/application/Espo/Modules/Crm/Controllers/Call.php
+++ b/application/Espo/Modules/Crm/Controllers/Call.php
@@ -22,7 +22,30 @@
 
 namespace Espo\Modules\Crm\Controllers;
 
+use \Espo\Core\Exceptions\Forbidden;
+use \Espo\Core\Exceptions\BadRequest;
+use \Espo\Core\Exceptions\NotFound;
+
 class Call extends \Espo\Core\Controllers\Record
 {
 
+	public function actionSendInvitations($params, $data)
+	{		
+		if (empty($data['id'])) {
+    		throw new BadRequest();
+		}
+		
+		$entity = $this->getRecordService()->getEntity($data['id']);
+		
+		if (!$entity) {
+			throw new NotFound();
+		}	
+		
+		if (!$this->getAcl()->check($entity, 'edit')) {
+			throw new Forbidden();
+		}
+		
+		return $this->getRecordService()->sendInvitations($entity);
+	}
+
 }
diff --git a/application/Espo/Modules/Crm/Controllers/Meeting.php b/application/Espo/Modules/Crm/Controllers/Meeting.php
index 49ba17da59..d3aa4ce1aa 100644
--- a/application/Espo/Modules/Crm/Controllers/Meeting.php
+++ b/application/Espo/Modules/Crm/Controllers/Meeting.php
@@ -22,7 +22,30 @@
 
 namespace Espo\Modules\Crm\Controllers;
 
+use \Espo\Core\Exceptions\Forbidden;
+use \Espo\Core\Exceptions\BadRequest;
+use \Espo\Core\Exceptions\NotFound;
+
 class Meeting extends \Espo\Core\Controllers\Record
-{
+{	
+	
+	public function actionSendInvitations($params, $data)
+	{		
+		if (empty($data['id'])) {
+    		throw new BadRequest();
+		}
+		
+		$entity = $this->getRecordService()->getEntity($data['id']);
+		
+		if (!$entity) {
+			throw new NotFound();
+		}	
+		
+		if (!$this->getAcl()->check($entity, 'edit')) {
+			throw new Forbidden();
+		}
+		
+		return $this->getRecordService()->sendInvitations($entity);
+	}
 
 }
diff --git a/application/Espo/Modules/Crm/Resources/templates/InvitationBody.tpl b/application/Espo/Modules/Crm/Resources/templates/InvitationBody.tpl
new file mode 100644
index 0000000000..5c6bf8f329
--- /dev/null
+++ b/application/Espo/Modules/Crm/Resources/templates/InvitationBody.tpl
@@ -0,0 +1,5 @@
+<p>Subject: {name}</p>
+<p>Date & time: {dateStart}</p>
+<p>
+<a href="{{acceptLink}}">Accept</a>, <a href="{{declineLink}}">Decline</a>
+</p>
diff --git a/application/Espo/Modules/Crm/Resources/templates/InvitationSubject.tpl b/application/Espo/Modules/Crm/Resources/templates/InvitationSubject.tpl
new file mode 100644
index 0000000000..5355701f83
--- /dev/null
+++ b/application/Espo/Modules/Crm/Resources/templates/InvitationSubject.tpl
@@ -0,0 +1 @@
+Invitation to the {activityType} '{name}'
diff --git a/application/Espo/Modules/Crm/Services/Meeting.php b/application/Espo/Modules/Crm/Services/Meeting.php
index ab81405909..242e95a35f 100644
--- a/application/Espo/Modules/Crm/Services/Meeting.php
+++ b/application/Espo/Modules/Crm/Services/Meeting.php
@@ -29,6 +29,86 @@ use \Espo\Core\Exceptions\Forbidden;
 
 class Meeting extends \Espo\Services\Record
 {
+	protected function init()
+	{
+		$this->dependencies[] = 'mailSender';
+		$this->dependencies[] = 'preferences';
+		$this->dependencies[] = 'i18n';
+	}
+	
+	protected function getMailSender()
+	{
+		return $this->injections['mailSender'];
+	}
+
+	protected function getPreferences()
+	{
+		return $this->injections['preferences'];
+	}
+	
+	protected function getI18n()
+	{
+		return $this->injections['i18n'];
+	}
+	
+	
+	protected function parseInvitationTemplate($contents, $entity, $invitee = null)
+	{
+		$contents = str_replace('{name}', $entity->get('name'), $contents);
+		$contents = str_replace('{activityType}', strtolower($this->getI18n()->translate($entity->getEntityName(), 'scopeNames')), $contents);
+		$contents = str_replace('{dateStart}', $entity->get('dateStart'), $contents);
+		return $contents;
+	}
+	
+	protected function sendInvitation(Entity $entity, Entity $invitee)
+	{
+		$email = $this->getEntityManager()->getEntity('Email');
+		$email->set('to', $invitee->get('emailAddress'));
+		
+		$subjectTplFileName = 'custom/Espo/Custom/Resources/templates/InvitationSubject.tpl';
+		if (!file_exists($subjectTplFileName)) {
+			$subjectTplFileName = 'application/Espo/Modules/Crm/Resources/templates/InvitationSubject.tpl';
+		}		
+		$subjectTpl = file_get_contents($subjectTplFileName);
+		
+		$bodyTplFileName = 'custom/Espo/Custom/Resources/templates/InvitationBody.tpl';
+		if (!file_exists($bodyTplFileName)) {
+			$bodyTplFileName = 'application/Espo/Modules/Crm/Resources/templates/InvitationBody.tpl';
+		}		
+		$bodyTpl = file_get_contents($bodyTplFileName);
+		
+		$subject = $this->parseInvitationTemplate($subjectTpl, $entity, $invitee);
+		$body = $this->parseInvitationTemplate($bodyTpl, $entity, $invitee);
+		
+		$email->set('subject', $subject);
+		$email->set('body', $body);
+		$email->set('isHtml', true);
+		
+		$emailSender = $this->getMailSender();
+		
+		$emailSender->send($email);		
+	}
+	
+	public function sendInvitations(Entity $entity)
+	{	
+		$users = $entity->get('users');
+		foreach ($users as $user) {
+			$this->sendInvitation($entity, $user);
+		}
+		
+		$contacts = $entity->get('contacts');
+		foreach ($contacts as $contact) {
+			$this->sendInvitation($entity, $contact);
+		}
+		
+		$leads = $entity->get('leads');
+		foreach ($leads as $lead) {
+			$this->sendInvitation($entity, $lead);
+		}
+		
+		return true;		
+	}
+	
 	protected function storeEntity(Entity $entity)
 	{
 		$assignedUserId = $entity->get('assignedUserId');
diff --git a/application/Espo/Services/Email.php b/application/Espo/Services/Email.php
index 8cb127a5b1..2c6cdb8701 100644
--- a/application/Espo/Services/Email.php
+++ b/application/Espo/Services/Email.php
@@ -18,7 +18,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
- ************************************************************************/ 
+ ************************************************************************/
 
 namespace Espo\Services;
 
@@ -28,90 +28,90 @@ use \Espo\Core\Exceptions\Error;
 
 class Email extends Record
 {
-	
+
 	protected function init()
 	{
 		$this->dependencies[] = 'mailSender';
 		$this->dependencies[] = 'preferences';
 	}
-	
+
 	protected function getMailSender()
 	{
 		return $this->injections['mailSender'];
 	}
-	
+
 	protected function getPreferences()
 	{
 		return $this->injections['preferences'];
-	}	
-	
+	}
+
 	public function createEntity($data)
 	{
 		$entity = parent::createEntity($data);
-		
+
 		if ($entity && $entity->get('status') == 'Sending') {
 			$emailSender = $this->getMailSender();
-			
+
 			if (strtolower($this->getUser()->get('emailAddress')) == strtolower($entity->get('from'))) {
-				$smtpParams = $this->getPreferences()->getSmtpParams();												
+				$smtpParams = $this->getPreferences()->getSmtpParams();
 				if ($smtpParams) {
-					$smtpParams['fromName'] = $this->getUser()->get('name');									
+					$smtpParams['fromName'] = $this->getUser()->get('name');
 					$emailSender->useSmtp($smtpParams);
 				}
 			} else {
 				if (!$this->getConfig()->get('outboundEmailIsShared')) {
-					throw new Error('Can not use system smtp. outboundEmailIsShared is false.');					
+					throw new Error('Can not use system smtp. outboundEmailIsShared is false.');
 				}
-			}			
-			
-			$emailSender->send($entity);		
-			
+			}
+
+			$emailSender->send($entity);
+
 			$this->getEntityManager()->saveEntity($entity);
 		}
-		
+
 		return $entity;
 	}
-		
+
 	public function getEntity($id = null)
 	{
 		$entity = parent::getEntity($id);
 		if (!empty($id)) {
-			
+
 			if ($entity->get('fromEmailAddressName')) {
 				$entity->set('from', $entity->get('fromEmailAddressName'));
 			}
-		
+
 			$entity->loadLinkMultipleField('toEmailAddresses');
 			$entity->loadLinkMultipleField('ccEmailAddresses');
 			$entity->loadLinkMultipleField('bccEmailAddresses');
-			
-			$names = $entity->get('toEmailAddressesNames');			
+
+			$names = $entity->get('toEmailAddressesNames');
 			if (!empty($names)) {
 				$arr = array();
 				foreach ($names as $id => $address) {
 					$arr[] = $address;
 				}
-				$entity->set('to', implode('; ', $arr)); 
+				$entity->set('to', implode('; ', $arr));
 			}
-			
-			$names = $entity->get('ccEmailAddressesNames');			
+
+			$names = $entity->get('ccEmailAddressesNames');
 			if (!empty($names)) {
 				$arr = array();
 				foreach ($names as $id => $address) {
 					$arr[] = $address;
 				}
-				$entity->set('cc', implode('; ', $arr)); 
+				$entity->set('cc', implode('; ', $arr));
 			}
-			
-			$names = $entity->get('bccEmailAddressesNames');			
+
+			$names = $entity->get('bccEmailAddressesNames');
 			if (!empty($names)) {
 				$arr = array();
 				foreach ($names as $id => $address) {
 					$arr[] = $address;
 				}
-				$entity->set('bcc', implode('; ', $arr)); 
-			}			
-			
+				$entity->set('bcc', implode('; ', $arr));
+			}
+
 		}
 		return $entity;
 	}