Authenticated Users Can't Relay SMTP

Tech-Archive recommends: Fix windows errors by optimizing your registry

Hey All,

I have a outside employee on Oulook hooked up through POP3/SMTP. The
POP3 part works fine but sending emails gets bounced with "550 5.7.1
Unable to relay for user@xxxxxxxxxxxxxxxxxxx" Emails sent to AD users
work fine, but then again there's no relaying involved in that
scenario.

Firewall is setup fine. I did the telnet test to port 25 from an
external machine. Also, I can relay messages if I" Allow all computers
except list below" in relay restrictions but that's not an option I can
live with.

The setup for the Default SMTP Virtual Server in ESM is as follows:

Authentication:
(X)Anonymous
( )Resolve anonymous
(X)Basic auth.
( )Requires TLS
Default domain: externalDomain.com
(X)Integrated Windows Auth.
Grant or Deny...

Certificated: None configured

Connection: (X) All except the list below (list is empty)

Relay Restrictions:
(X) Only The List Below (list is Empty)
( ) Allow all Except List Below
(X ) Allow all computers which successfully authenticate....
Grant or Deny... set to the same two user groups as indicated above.


I've Googled around and found a few threads inquiring about this
problem but they always end abruptly and never with an answer that
works. Help!

Thanks!

.

Relevant Pages

  • error 551 unable to relay (local user)
    ... I am sending emails from within our local network (so not trying to ... smtp;551 This is not a relay host - mail must be to ... Tried telnetting to our mail server and manually sending the email. ...
    (microsoft.public.exchange2000.admin)
  • Re: [opensuse] Another problem authenticating with postfix.
    ... I define in the transport file which sould use a relay choosed on the from. ... to some destinations I want to send direct. ... the problem of sending emails with redirector aliasses. ... Okay, unfortunately I've seen too many ISPs who silently delete unwanted ...
    (SuSE)
  • Cannot send external email
    ... We are sending emails using SMTP sending through our Exchange 2000 server ... which has the relay turned off. ...
    (microsoft.public.inetserver.iis.smtp_nntp)
  • Re: How to restrict outgoing email to local/company domain only?
    ... Taylor, Grant wrote: ... you could remove all domains from class w (local-host-names) and add your domain name to class R. ... your Test / Development / QA servers would only relay for your main domain name. ... Though I'm not sure how to get Sendmail to not relay for local host. ...
    (comp.mail.sendmail)
  • Re: exim4 configuration in sid
    ... AFAIK it is empty until the first mail. ... Your exim probably doesn't think ... himself as the server for "empty" so he tries to relay the mail. ...
    (Debian-User)