On Sun, 6 Jun 1999 03:03:20 -0400, "Alan S. Dobkin" <[log in to unmask]> wrote: >Error-Text: Mailer mxnx.berlinetz.de said: >"550 '<[log in to unmask]>SIZE=35126' >sender address target 'LISTSERV.CC.EMORY.EDU' is not a valid e-mail >domain (there is no MX record for it)." I think the problem is the lack of a space after ~.EDU> and before SIZE=35126 so it is looking for the domain 'LISTSERV.CC.EMORY.EDU>SIZE=35126' which is invalid and does not exist. The error message in this case is misleading.