SMTP Response: 554 5.7.1

[coper]

Hello again,

I'm having a strange problem. I can use email accounts without a problem except from a particular office. Inside that office I can use webmail but when I try to send emails using an email software I get this error:

Code:

"The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'mail@domain.com'. Subject '', Account: 'mail.mydomain.com', Server: 'mail.mydomain.com', Protocol: SMTP, Server Response: '554 5.7.1 <mail@domain.com>: Relay access denied', Port: 25, Secure(SSL): No,
*Server Error: 554, Error Number: 0x800CCC79

And I get this in the server logs:

Code:

Jul 27 17:32:33 webserver1 postfix/smtpd[14643]: warning: 190.210.26.245: address not listed for hostname customer-static-210-26-245.iplannetworks.net
Jul 27 17:32:33 webserver1 postfix/smtpd[14643]: connect from unknown[190.210.26.245]
Jul 27 17:32:33 webserver1 postfix/smtpd[14643]: NOQUEUE: reject: RCPT from unknown[190.210.26.245]: 554 5.7.1 <mail@otherdomain.com>: Relay access denied; from=<mail@domain.com> to=<mail@otherdomain.com> proto=SMTP helo=<ladc>
Jul 27 16:32:55 webserver1 postfix/smtpd[3617]: disconnect from unknown[190.210.26.245]

Could anyone help me with this?

Thanks.

c.

[kilburn]

This client is not authenticating itself as any user, so it's considered an external mailer and thus mails to domains outside the server are being rejected by postfix. Check the "server requires authentication" (or something like this) option in the mail client's configuration...

[kurgans]

I have had a similar problem with the same message we receive.
Problem domain was not included in the file
/ etc / postfix / ispcp / domains

Included executed manually reload postfix domain, restarted the service and returned to work well

cd / etc / postfix /
postmap domains
/ etc / init.d / postfix reload