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SMTP server returned error “Illegal address syntax from unknown in MAIL command:” when emailing the historical logs from an EGX300

Published date: 09 June 2020

The smtp server returned the following error:
Nov 26 09:16:03 ip-10-10-20-165 postfix/smtpd[23309]: warning: Illegal address syntax from unknown[] in MAIL command:
Also, the diagnostic page of the EGX300 shows a "connection error" under the SMTP portion.

Product Line


EGX300 built in webpage configuration 


The From Address: and To Address: are not in a format that the SMTP server recognizes. 


Add the signs "<" and ">" to the From Address: and To Address: fields. 

Now, verify proper email opperation.

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