On 9/12/10 7:11 AM Lonnie Maynard wrote: > Richard, Hi Lonnie, > > The safest way to do this is to enable and configure SMTP AUTH. This is > based on SASL, and you'll need to yum list "*cyrus-sasl*" to see the > packages you need. You can use plain text auth over starttls and the > user can then authenticate with their username and password securely. If > you don't use starttls, you'll need a more secure authorization mechanism. > > This will allow the user to authenticate and relay mail no matter what > IP address or network they are accessing your server from. Here's a link > for more information. > > http://www.sendmail.org/~ca/email/auth.html many thanks for your reply. OK. I've set up cyrus-sasl. cyrus-sasl.x86_64 2.1.22-5.el5_4.3 installed and created a new entry for one of our Users with "saslpasswd2". [root at mail mail]# telnet localhost 25 Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape character is '^]'. 220 mail.ourdomain.at ESMTP Sendmail 8.13.8/8.13.8; Sun, 12 Sep 2010 07:41:14 +0200 ehlo localhost 250-mail.ourdomain.at Hello tfefw1.tfe.local [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-DELIVERBY 250 HELP Now I need the right sendmail.cf entries for SASL-AUTH (we don't work with *.mc Files or similar. We directly edit the sendmail.cf files ;-) many thanks Richard