Thanks! In reality, does turning off the fixup protocol for SMTP make a system more vulnerable to spammers, or what not?
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Jim Bruner > Sent: Wednesday, December 04, 2002 11:40 AM > To: [EMAIL PROTECTED] > Subject: RE: [IMail Forum] SMTP AUTH Troubles > > > You need to turn off the fixup protocol for smtp on cisco routers... > > no fixup protocol smtp 25 > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Rich Garabedian > Sent: Wednesday, December 04, 2002 10:35 AM > To: [EMAIL PROTECTED] > Subject: [IMail Forum] SMTP AUTH Troubles > > > Hi, > > I'm trying to track down why SMTP auth seems not to be working. > I've poured > through the email archives and I think I've identified the problem, but in > all honesty I'm a software guy and the inner workings of mail servers are > extremely new to me. After researching this today, I have just enough > knowledge to be dangerous and I'm sure some of newbie assumptions are > incorrect. Any help is greatly appreciated. > > Problem: > > When outside the network, emails cannot be sent via IMail to outside email > recipients. When attempting to do so, Outlook responds with > something like: > > 550 unknown host, not a gateway > > Configuration: > > Outlook is configured to require authentication for outgoing mail. > IMail is set-up with "Relay Mail For", and a single IP address is > specified. > Also, the "Disable" checkboxes on the SMTP Security page are NOT checked. > > Logs: > > (Actual domain names and ips changed/removed) > > It looks like IMAIL is responding correctly to EHLO commands: > > 20021203 131321 127.0.0.1 SMTP (880) >EHLO mail.server.com > 20021203 131322 127.0.0.1 SMTP (880) 250-ntserver.server.com Hello > [mail.server.com] > 20021203 131322 127.0.0.1 SMTP (880) 250-XEXCH50 > 20021203 131322 127.0.0.1 SMTP (880) 250-HELP > 20021203 131322 127.0.0.1 SMTP (880) 250-ETRN > 20021203 131322 127.0.0.1 SMTP (880) 250-DSN > 20021203 131322 127.0.0.1 SMTP (880) 250-SIZE 0 > 20021203 131322 127.0.0.1 SMTP (880) 250-AUTH LOGIN > 20021203 131322 127.0.0.1 SMTP (880) 250 AUTH=LOGIN > > However, I found what I think is log data that shows an attempt to send > email from outside the network and it does not appear as though IMail is > getting the EHLO command: > > 20021203 115017 127.0.0.1 SMTPD (3192012E) [24.52.173.121] HELO > RICHLAPTOP > 20021203 115017 127.0.0.1 SMTPD (3192012E) [24.52.173.121] > MAIL FROM: > <[EMAIL PROTECTED]> > 20021203 115017 127.0.0.1 SMTPD (3192012E) [24.52.173.121] RCPT TO: > <[EMAIL PROTECTED]> > 20021203 115017 127.0.0.1 SMTPD (3192012E) [24.52.173.121] ERR > mail.server.com invalid user <[EMAIL PROTECTED]> > > I've seen some references in the mail archives to firewalls stripping the > Extended helo from request. We use a Cisco firewall ... could this be > happening to us? Is there an easy way to verify? > > Rich > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
