Luis campo wrote: > hi, > > have installed centos 4.7 > > We have installed qmail + simscan + vpopmail + SpamAssassin + clanAV > and when we send a mail from a particular domain, the following error leaves us > > How about changing that combination of qmail + simscan to postfix + clamav-milter + spamass-milter? In any case, you would also want to look at the qmail logs...was it a bounce? > > > I wonder if this problem can be for Centos 4.7 or which would be the problem. > > Or the Microsoft SMTP service if you want to go this far.