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