I asked the list about this and then wrote to the postmaster of att.com... here is his reply: Date: Tue, 4 Aug 92 10:49 EDT From: [log in to unmask] Subject: Re: Delivery error notice sent to list IPCT-L I've been looking into this recently ... I think I have it narrowed down. It appears that ATTMAIL's mailer won't accept email that has *any* header line longer than like 128 chars !! Example: > From: internet!pucc.Princeton.EDU!GUVM.BITNET!IPCT-L > internet!pucc.Princeton.EDU!nevada2.BITNET!msmauri (Interpersonal Compu > ***ting and I've been in conversation with them to 1) confirm that their software does this and 2) stop it. We here at att.com do gatewaying for attmail.com. I am pretty sure that whomever you send the list to either forwards their email to attmail.com from their att.com address or you have an attmail.com address in your list. Joseph Judge [log in to unmask] }|{ mauri -------------------------------------------------------------------- (ms) mauri collins /\\//\ Managing Editor: Internet: [log in to unmask] > () < The IPCT Electronic Journal BITnet: collins@nevada3 \/()\/ Georgetown U/Penn State U Moderator: IPCT-L@GUVM - Interpersonal Computing and Technology List. ---------------------------------------------------------------------