php-SMTP“错误：服务器不接受数据！” InMotionHosting 上的 Opencart 2.3

我安装了一个全新的Opencart 2.3.0.2在…上Inmotionhosting除了邮件设置，我尝试了许多不同的组合。虽然它显示了"Error: DATA not accepted from server!"，但它成功地发送了邮件！

托管支持中心表示一切正常，所以这应该是一个编码问题！

邮件设置：

Mail Protocol: SMTP
Mail Parameters: -fnoreply@mywebsite.com
SMTP Hostname: mail.mywebsite.com
SMTP Username: noreply@mywebsite.com
SMTP Password: ********
SMTP Port: 587
SMTP Timeout: 5

完整错误详细信息：

Fatal error:  Uncaught exception 'Exception' with message 'Error: DATA not accepted from server!' in /home/mywebsite/public_html/mywebsite.com/oc/system/library/mail.php:409
Stack trace:
#0 /home/mywebsite/public_html/mywebsite.com/oc/catalog/model/account/customer.php(81): Mail->send()
#1 [internal function]: ModelAccountCustomer->addCustomer(Array)
#2 /home/mywebsite/public_html/mywebsite.com/oc/system/engine/loader.php(178): call_user_func_array(Array, Array)
#3 [internal function]: Loader->{closure}(Array, Array)
#4 /home/mywebsite/public_html/mywebsite.com/oc/system/engine/proxy.php(25): call_user_func_array(Object(Closure), Array)
#5 /home/mywebsite/public_html/mywebsite.com/oc/catalog/controller/account/register.php(21): Proxy->__call('addCustomer', Array)
#6 /home/mywebsite/public_html/mywebsite.com/oc/catalog/controller/account/register.php(21): Proxy->addCustomer(Array)
#7 [internal function]: ControllerAccountRegister->index()
#8 /home/mywebsite/public_html/mywebsite.com/oc/system/engine/action.php(51): call_user_func_array(Array, Array)
#9 /home/sabour in /home/mywebsite/public_html/mywebsite.com/oc/system/library/mail.php on line 409

你知道如何消除这个错误吗？