The original message was received at Tue, 24 Oct 2023 04:46:36 -0700 from m0342469.ppops.net [127.0.0.1] ----- The following addresses had permanent fatal errors ----- <ealbats@stanford.edu> (reason: 550 5.1.1 User Unknown) ----- Transcript of session follows ----- ... while talking to mxa-00000d03.gslb.pphosted.com.:

...

...

DATA <<< 550 5.1.1 User Unknown 550 5.1.1 <ealbats@stanford.edu>... User unknown <<< 503 5.5.1 Need RCPT (recipient)