my delivermail eats messages to aliased users.

[utzoo!decvax!ucbvax!mhtsa!harpo!floyd!trb]

I am running 4.1bsd.  I was getting flakey service from Mail, because I
had comment fields on my aliases (so I thought), e.g.:

test:floyd!trb	# Andy Tannenbaum

newaliases did NOT complain about these comment fields, but my messages
were not getting through.  So I deleted the comment fields and made a new
aliases.* with newaliases.  The aliases.* were smaller, a good sign.  But
my mail to aliased things just disapears.  I now have an aliases file
that consists of one line:

test:trb

(it sends test to me).  I Mail to test and it just gets swallowed.
No error messages, no messages mailed to root or daemon or uucp or me.
Nothing.  Perplexing.  Any suggestions?
	Andy Tannenbaum chico!floyd!trb (not aliased)