[Exim] odd reject file entry

I found the following entry in my reject log.
What exactly does it mean- is the sender malforming my address?

2000-01-13 21:57:19 128sF4-0008Bc-00 warning: from unity.ama-assn.org
[206.189.190.122] <ArchDermTOC@???>: syntax error in 'To'
header: malformed address: <pollywog@???>\n may not follow
pollywog@??? : failing address is: pollywog@???
<pollywog@???>



thanks

--
Andrew