My guess: 1) recipient's ISP is not accepting a "null" RFC821 MAIL FROM:<> contrary to RFCs 2) it's hard to say if the ISP is "eating" the output. Editorial Comment: perhaps the user instead should be losing patience with his/her ISP instead! E.g., I regularly advise certain ISP customers to switch to a more reliable provider or to ask them to fix their anti-spam a/v software config. /Pete At 16:24 09/03/2003 Wednesday, David Rubin wrote: >For some addresses, information mails from Listserv do not reach the sender. > >Those same addresses have no problem receiving normal mail from Listserv, such as list postings and DISTRIBUTE jobs. > >For example, issuing a REVIEW command results in one message from Listserv >confirming the command, but no subsequent message containing the LIST file. > >This only happens with certain ISPs, so I suspect Listserv or LSMTP is creating >a message that is incorrectly rejected by the ISP. However, I see no >evidence of >this in the log files; it appears that the mail is delivered.