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Fixing the 550 5.7.1 [ESA] sender blocked error



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Diagnostic-Code: smtp; 550 5.7.1 [ESA] Sender blocked.

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If you're receiving this error, it means we have detected extensive abuse originating from your email account. Examples of abuse include:

  • Spam email
  • Bulk email
  • High complaint rates
  • Lots of invalid recipients

The 550 5.7.1 [ESA] block is based upon cumulative temporary blocking for a particular sending account. After a number of these temporary blocks have been issued and our system continues to see the problematic traffic, a permanent block is issued which must be manually removed in order to continue sending/relaying through the MailChannels systems.
How can I unblock my account as an end-user?

1) In MailChannels Console, search for the blocked sender and click the "Report Issue" icon. If the account has been blocked with this error message, it will be unblocked automatically.
2) Every time an email is blocked with "550 5.7.1 [ESA] Sender blocked", a notification gets sent out to the email address you have configured. The notification will also contain a link to unblock the account. If you automate the process, you can POST to the URL to unblock the account.
How do I enable notifications?
Enable "Receive Notifications" by logging into the MailChannels Console, if you have not done so already. Refer the following article on enabling notifications.
https://mailchannels.zendesk.com/hc/en-us/articles/202221080-How-to-enable-compromised-account-notifications-
IMPORTANT: If an account is unblocked without securing the account, it would get blocked again. An account can be unblocked without any manual intervention only once every 30 days.

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The Log Search area of our Host Console can be used to locate and delist a sender blocked with the ESA message.


  1. Login to your Host Console and navigate to Outbound > Log Search.
  2. Using the Log Search bar or advanced filter options, locate the blocked message you wish to unblock.

  3. After locating the message log in the Log Search area of your console, click the "Flag" icon to open the "Report an Issue" popup. When a sender is blocked with ESA, this area will include a "Delist Sender" button. Click this button to remove the blocked sender. It is important that you secure the account first, or delisting will result in being blocklisted again. The account will be delisted immediately without any manual intervention by MailChannels Support.
  4. ​
  5. If you would like to receive details on why this sender is blocked, open up a support ticket by clicking "Submit" after entering the problem title and a brief description.

Note: If an account is unblocked without securing the account, it might get blocked again. An account can be delisted automatically from the Host Console only once every 30 days.



ÇáãÑÌÚ:
https://mailchannels.zendesk.com/hc/...-blocked-error
https://www.interserver.net/tips/kb/...back-errors-2/