It's not clear to me that x822 headers will help. Sounds like either those userids don't exist (possible); the receiving host's A/V software was changed recently; OR the secondary MX hosts that are handling the mail don't know that they are supposed to. This is a frequent problem, esp. when multiple sites are involved. /Pete At 10:37 09/09/2002 Monday, Andrew Bosch wrote: >Is anyone having problems with recipients' mail servers rejecting mail from >Listserv with these sorts of messages: > >553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) >550 5.7.1 <[log in to unmask]>... Relaying denied >550 5.1.1 <[log in to unmask]> ... relaying is Not allowed here >550 <[log in to unmask]>... Relaying denied > >Is there a way around apart from using the short822 or full822 list >options? > >Andrew End Reply