SAP Knowledge Base Article - Public

2989995 - Output Error "Recipient address rejected ERS Customized Block" After Sending E-mail


You are facing this such error message in the output of an e-mail:

5.1.0 - Unknown address error 550-'5.7.1 <XXX@XXXXXXX.XXX>: Recipient address rejected: ERS-Customized-Block.'


SAP Business ByDesign

Reproducing the Issue

For example:

  1. Go to Customer Invoice.
  2. Go to Invoice Documents.
  3. Open an object.
  4. Go to Output History tab.


The recipient has a custom E-mail Reputation Service which is blocking the emails from SAP.


As the recipient mail server is rejecting the mail from SAP we cannot do anything at SAP side.
You will need to check with the recipient's e-mail service provider and ask to unblock the emails from SAP.

If needed you can send the following IP addresses to be allowed:,,,


 Recipient address rejected, ERS-Customized-Block , KBA , AP-RC-OUT , Output Management , How To


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