> We are not receiving some LISTSERV responses.
>
> For example, if we send a command: REVIEW LIST-L, we get back a message
> saying that LIST-L LIST has been mailed under separate cover. However, we
> never receive the second message.
>
> The LISTSERV log file indicates the mail was sent. We're using LSMTP as the
> mail agent. I'd appreciate any ideas on how to track this down.

Are you saying you don't get the message from an LSMTP POP account or is
this with Yahoo or some other ISP's mailer?  I have to assume the latter
at this point. The first place I would check is the LISTSERV/SPOOL for any
old  *.MAIL  files. Then LSMTP to make sure the message was sent. After
that you can blame the ISP (which is most likely the case).