CSSMTP generates an error report for syntax errors on the HELO / EHLO command. If there is a valid HELO / EHLO command earlier in the JES spool file, emails might still be accepted by CSSMTP.
After processing the command 'HELO domain_name mm/dd/yy', CSSMTP generates an error report that contains the following:
501 5.5.4 JES Syntax error. Too many args after 'HELO' command
CSSMTP expects the HELO / EHLO command to follow the syntax as described in RFC 2821.
Resolving The Problem
Valid syntax for HELO / EHLO is:
where domain_name specifies the domain name of the sending host.
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15 June 2018