Outlook express cannot send mail using exchange 2007 but can recieve mail

Posted on 2008-11-07
Last Modified: 2012-05-05
We have an exchange 2007 installed behind Cisco Pix Firewall. The outlook 2003 can send and recieve mails there is not issues but users using outlook express externally and internally cannot send mail. They are getting this error "The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was Subject 'test', Account: exchange server name , Server: '', Protocol: SMTP, Server Response: '550 5.7.1 Client does not have permissions to send as this sender', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78".We can recieve the mails but cannot send. In the incomming and outgoing server setting exchange server ip address is given. POP3 Service and smtp service is running. Anything more configuration is needed for outlook express? Please asist.
Question by:abey_v
    LVL 16

    Expert Comment


    Change the outgoing mail port to 587 in Outlook Express.

    1. Open Outlook Express
    2. Click the Tools menu, then click Accounts.
    3. Click your e-mail account, then click the Properties button.
    4. Click the Advanced tab.
    5. In the Outgoing Mail (SMTP) box, type 587.
    6. Click the OK button.
    7. Click the Close button.

    Hope this helps.

    LVL 9

    Expert Comment

    the other option would be that the exchange server wants the user to authenticate.
    under the account setup check advanced settings.  there is a section that deals with authentication while sending.

    Accepted Solution

    The problem was solved when i given the authentication setting as annonymous in the default recieve conector in exchange 2007.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    IT, Stop Being Called Into Every Meeting

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Use email signature images to promote corporate certifications and industry awards.
    "Migrate" an SMTP relay receive connector to a new server using info from an old server.
    To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Rules tab.:  To cr…
    This video discusses moving either the default database or any database to a new volume.

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    14 Experts available now in Live!

    Get 1:1 Help Now