Given that you're getting the same error text for multiple recipient
domains, it's a good bet that your local SMTP server is what's flagging
the message as spam and bouncing it back to LISTSERV.  I would check
whatever system(s) you're using for your LISTSERV SMTP_FORWARD_* host(s)
and whatever spam filtering is in place there.  You may need to whitelist
your own LISTSERV server and/or look into why your SMTP server considered
the list mail to be spam.

--
Liam Kelly
Senior Consulting Analyst
L-Soft international
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