If anyone from Buffalo.edu on this list please note the following: This is mainly a question for the Lsoft folks about what I suspect is a config error in the buffalo.edu Listserv. That Listserv has been sending me probes for a list I subscribe to, and my ISP has been failing to deliver these probes because buffalo has been refusing to accept Sender Address Verification (SAV) attempts from my ISP. The probes are from: <owner-WPWIN-L*richgr**PANIX*[log in to unmask]> The Buffalo site, however, does not accept mail for the VERF-return addresses, or at least not in this context. Panix's mail servers presented listserv.buffalo.edu with an attempt to deliver mail to the above address, and was told: host mxa.acsu.BUFFALO.EDU[128.205.5.193] said: 550 5.1.1 <owner-WPWIN-L*richgr**PANIX*[log in to unmask]>: Recipient address rejected: User unknown in relay recipient table (in reply to RCPT TO command) Panix's mail servers then relayed that error message back to the buffalo.edu mail servers that were trying to send me that message. The buffalo.edu servers then sent me a copy of the error, but they sent it using a different return address that did not encounter this problem, so I was able to receive the error message. Q for Lsoft: Why is Buffalo not accepting this? I assume it is supposed to because I get probes from at lest 4-5 other Listserv sites and only the probes from Buffalo are having the problem. Wouldn't this mean that ALL probe failures are failing? I am getting mail from the Buffalo list with no problems. -- Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543 1353 Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67 Canines:Val, Red, Shasta & Casey (RIP), Red & Zero, Siberians Owner:Chinook-L Retired at the beach Asst Owner:Sibernet-L