- Nextcloud Server version
- 25.0.13
- Operating system and version
- Ubuntu 20.04.6 LTS
- PHP version
- 7.4.3
An error occurs when trying to send an email to any external email address:
We use an Exchange mail server
The mail server settings in NextCloud are listed below
"Способ отправки - SMTP
Шифрование - STARTTLS
Адрес отправителя - nextcloud@my.domain;
Метод проверки подлинности - Простой;
Требуется аутентификация - Нет;
Адрес сервера - my.mail.server; Порт - 25"
Log
Swift_TransportException: Expected response code 354 but got code “503”, with message "503 5.5.2 Need rcpt command "
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php - line 344:
Swift_Transport_AbstractSmtpTransport->assertResponseCode()
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php - line 305:
Swift_Transport_AbstractSmtpTransport->executeCommand()
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php - line 392:
Swift_Transport_EsmtpTransport->executeCommand()
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php - line 499:
Swift_Transport_AbstractSmtpTransport->doDataCommand()
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php - line 518:
Swift_Transport_AbstractSmtpTransport->doMailTransaction()
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php - line 206:
Swift_Transport_AbstractSmtpTransport->sendTo()
/var/www/nextcloud/3rdparty/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php - line 71:
Swift_Transport_AbstractSmtpTransport->send()
/var/www/nextcloud/lib/private/Mail/Mailer.php - line 191:
Swift_Mailer->send()
/var/www/nextcloud/apps/settings/lib/Mailer/NewUserMailHelper.php - line 184:
OC\Mail\Mailer->send()
/var/www/nextcloud/apps/provisioning_api/lib/Controller/UsersController.php - line 1408:
OCA\Settings\Mailer\NewUserMailHelper->sendMail()
/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 225:
OCA\Provisioning_API\Controller\UsersController->resendWelcomeMessage()
/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 133:
OC\AppFramework\Http\Dispatcher->executeController()
/var/www/nextcloud/lib/private/AppFramework/App.php - line 172:
OC\AppFramework\Http\Dispatcher->dispatch()
/var/www/nextcloud/lib/private/Route/Router.php - line 298:
OC\AppFramework\App::main()
/var/www/nextcloud/ocs/v1.php - line 64:
OC\Route\Router->match()
/var/www/nextcloud/ocs/v2.php - line 23:
require_once(“/var/www/nextcloud/ocs/v1.php”)
PLEASE HELP!!! 
