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SMTP server error "550 Unsupported ESMTP extension" on MAIL FROM:... AUTH=<> [with fix] #164
hMailserver SMTP server erroneously aborts an inbound ESMTP connection if the MAIL FROM line contains the parameter "AUTH=<>"
This parameter should be ignored, however hMailserver is not parsing it correctly because of the following typo at line 473 of SMTPConnection.cpp: