Hi, Thanks for the response. One question however. The "spammer@xxxxxxx" that is the envelope from, correct? We offer an authenticated server for people to use to send email via a fat client such as Thunderbird. The problem I'm trying to solve is to refuse their connection when they authenticate and not at the envelope from, aka earlier in the SMTP session. We unfortunately have too many people with compromised credentials using the service. Thanks. Jim -- Jim Howell Cornell University CIT Infrastructure, Unified Comm. Msging Group, Lead Email Specialist email: jwh2@xxxxxxxxxxx Phone: 607-255-9369 On 10/22/13 8:42 AM, "Mogens Melander" <mogens@xxxxxxxxxxxxx> wrote: >http://www.sendmail.com/sm/open_source/docs/m4/anti_spam.html#access_db > >spammer@xxxxxxx REJECT >cyberspammer.com REJECT >TLD REJECT >192.168.212 REJECT >IPv6:2002:c0a8:02c7 RELAY >IPv6:2002:c0a8:51d2::23f4 REJECT > >On Tue, October 22, 2013 14:31, Jim Howell wrote: >> Hi, >> I wouldn't normally ask a Sendmail question in this list but I'm not >>sure >> where else I can ask it. In the Sendmail Access database is there a way >> to disallow specific ids from authenticating to send email?? >> Jim >> >> >> -- >> Jim Howell > > >-- >Mogens Melander >+66 8701 33224 > >-- >This message has been scanned for viruses and >dangerous content by MailScanner, and is >believed to be clean. > >