Admin-Ahead Community
Windows => Control Panels => Plesk => Topic started by: vinayakk on February 11, 2014, 10:49:27 pm
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Plesk panel shows the below error :
Sending email to the server fails with error:
550 This mail server requires authentication (0) when attempting to send via this SMTP (submission) port
This error is caused because the SMTP service has been configured to force all inbound connections to authenticate.
When this error is received it means that the MailEnable server SMTP service has been configured to force all inbound connections to authenticate. This setting is designed mainly for servers that want all mail to come from a remote spam checking service as it forces connections that send to and through the server to authenticate unless they are allowed relay by IP. All other connections even when simply sending to the server will fail with this error if this is not the case.
In the ME Admin MMC this is configurable at:
ME Admin MMC->Servers->Localhost->SMTP Properties->Inbound (TAB)->"Properties"->Port Settings [Button]->SMTP Port->"Requires connections to authenticate before sending email"
Or for alternate SMTP listening port:
ME Admin MMC->Servers->Localhost->SMTP Properties->Inbound (TAB)->"Properties"->Port Settings [Button]->Submission Port->"Requires connections to authenticate before sending email"
The resolution is determined by whether you want this feature to be enabled or not. If you are getting this error when you are not expecting then ensure that this feature is not enabled for either SMTP port. If you require this feature and understand what it does then ensure any servers that are required to send through the server and not authenticate are added to the inbound IP relay list.
:)