I'm assuming dotLRN still uses ns_sendmail to send mail from
AOLserver, like OpenACS has for years. So, in your AOLserver
config.tcl file, look in the
ns/parameters section and
check the values, if any, that you have for these parameters:
smtphost, mailhost, smtptimeout, smtpport
For most people, simply not setting any of those at all will do the
right thing. But if you have an atypical mail server setup, you'll
need to specify non-default values for some them. You have qmail
running on the same box so you don't need to set smtphost at all, but
maybe it is set, but to the wrong value?
