Article ID: 117527, created on Sep 26, 2013, last review on Jun 17, 2016

  • Applies to:
  • Plesk 12.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 11.5 for Windows


  1. Accessing the MailEnable SMTP service produces an error that the connecting IP address has been "denied access".

    Example error:

    530 ESMTP MailEnable Service, Version: 0--1.1 denied access at 09/06/05 17:04:25
    Connection to host lost.
  2. Connection from outside to server IP address and 25 port does not work:

    220 ESMTP MailEnable Service, Version: 0--1.1 denied access at 09/26/13 21:53:27 
    Connection lost

The same error can be found in MailEnable Management > Servers > localhost > Services and Connectors > SMTP > Logs > Activity > SMTP-Activity-xxx.log.


The IP address of the inbound connection has been denied access in the SMTP Access Control properties of the MailEnable Administration Program or has been automatically banned because of too many subsequent invalid commands.


  1. Navigate within the Administration console to the following location: Servers>localhost>connectors>SMTP, right click on SMTP and select Properties in the menu.

  2. Next navigate to the Inbound tab and click on Access control.

  3. Ensure that the Access control option is set to granted access and that the IP address of the incoming connection is not present within the Except those listed below window.


The incoming IP address can automatically be added to the inbound Access control list if the SMTP security connection dropping option is enabled. The SMTP service will drop the connection when the failed number of commands or recipients is exceeded and add the IP address to the inbound Access control list.


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530 ESMTP MailEnable Service denied access at


a914db3fdc7a53ddcfd1b2db8f5a1b9c 56797cefb1efc9130f7c48a7d1db0f0c 46a8e394d6fa13134808921036a34da8 85a92ca67f2200d36506862eaa6ed6b8 bd7fc88cf1b01f097749ae6f87272128 ed7be2b984f9c27de1d2dc349dc19c6d a766cea0c28e23e978fa78ef81918ab8 8b661cab116c79dbe6c4ac5bbdf1c8cb

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