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smtpd_sender_restrictionsonly affects mail based onreturn path, not MAIL FROM header as it says in the docs. Not sure if this is a bug or what. I tried spoofing an email to my server that should have been rejected by settingfromin the header and it had no effect. When i added the-fflag to sendmail to specify return path it successfully rejected my email.smtpd_sender_restrictionswill only block mail based on itsReturn-Pathheader NOT itsFromheader. So if yoursmtpd_sender_restrictions hash:/etc/postfix/blockcontains[email protected] REJECTmail withFrom: [email protected]will NOT be rejected; rather, only mail withReturn-Path: [email protected]will be blocked (!!) Arrrrgh.