SMTP error from remote mail server after RCPT


  • I'm getting below error while sending email from outlook.

    SMTP error from remote mail server after RCPT TO:<ID@DOMAIN.COM>:
    host mail.HOST.com. []: 550 5.7.1 Unable to relay

    server is EXCHANGE 2007
    Monday, February 08, 2010 5:00 AM

All replies

  • Hi,

    You send a mail to HOST.com, but you receive the NDR. Can you send mails to other outside domain?
    Or you just receive NDR from HOST.com?

    If yes, seems like there is some configuration issues with HOST.COM domain.
    For example, HOST.COM is not set as authoritative domain.

    Could you please also make a telnet test to HOST.com?
    How to Use Telnet to Test SMTP Communication

    Frank Wang
    • Proposed as answer by emma.yoyo Friday, February 12, 2010 1:52 AM
    Tuesday, February 09, 2010 8:36 AM
  • Hi,

    How about your question?Any update?
    Frank Wang
    Thursday, February 11, 2010 2:52 AM
  • Hi
    I configured the new DNS servers changed the namservers every thing is working fine just Exchange is creating issue. We have two Namservers. Some time emails are delivered and able to receive replies but sometimes they are rejecetd.

    Telnet is working fine on all ports. Same time updated the Juniperfirewall Antispam and Antivirus subscription but able to send by official id, gmail, hotmail and yahoo why not able to send and receive fom particular domain.

    Friday, February 12, 2010 4:31 AM