Lately, the Listserv here has been generating an unsual number of error messages involving Yahoo addresses. The messages all refer to a "No valid From: line in message". This is with Listserv 1.8d running under Compaq Tru64-Unix 4.0f. Does anyone know what's causing this and if its a problem on Listserv or with Yahoo? A sample of such an error message is: <[log in to unmask]>: 205.180.60.143 failed after I sent the message. Remote host said: 552 No valid From: line in message