> Roger> One difference is that qmail apparently always sends a separate > Roger> copy of a message to each recipient and may open up many > Roger> connections in parallel to do this. > > yes it does this. > > Roger> for faster delivery in common cases, it might bite you if you > Roger> have a mailing list (as we do) with hundreds or thousands of > Roger> subscribers on a small number of hosts. > > bite whom? the sending site or the receiving site? It's the receiving host I am worried about in this case. If 5000 separate messages arrived in a short period of time, I know of at least one of our hosts that would have trouble dealing with it. Probably some of the others would too. 50 copies of a message with 100 recipients each are much easier for it to handle. > Roger> Also, I don't think that qmail generates bounces in the Internet > Roger> DSN format that can be automatically interpreted by LISTSERV. > > this is a non-issue. the largest source of bounces for any well know list > is aol. e.g. That's not true for my lists. I have AOL subscribers, but they do not generate the majority of bounces on my lists. I suppose it's related to the subjects that the lists cover. Anyway, AOL has stated that they are working on implementing bounce messages in DSN format. > qmail does two things listserv admins like -- 1) it has wildcard address so > probing works and 2) it's trivial* to fix gross things like the aol bounce > above. Probing is good. There's a probe interface for sendmail, but it's not supported by L-Soft. > the same script that rewrites the aol bounce to dsn also converts qmail's > qsbmf format. > > *well some formats like aol's are easy to do. some are a lot harder so we > don't bother. I'm not really interested in being in the business of producing scripts to rewrite bounce messages.