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Basically, sendmail is now trying to send as user HPRS\firstname.lastname@example.org:
Jul 21 00:46:35 mail sendmail: u6L4kZms015987: Authentication-Warning: mail.hprs.local: HPRS\\mark set sender to @ohprs.org using -r Jul 21 00:46:35 mail sendmail: u6L4kZms015987: @ohprs.org... User address required Jul 21 00:46:35 mail sendmail: u6L4kZms015987: from="HPRS\\\\mark",
----- The following addresses had permanent fatal errors ----- HPRS\email@example.com (reason: 550 5.1.1 <HPRS\firstname.lastname@example.org>... User unknown) (expanded from: HPRS\email@example.com)
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