exchange server 2003

Posted on 2006-05-23
Last Modified: 2012-05-05

we are running exchange server 2k3
an external sender to our company has reported the following errror when sending emails to certain users within our exchange organisation
sometime the email message will be deliver sometimes it will not

the external user is getting the following messages:

The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.

            < mailhost.sender's #5.0.0 X-Symantec-Mail-Security; host[] said: 550 5.7.1 Requested action not    taken: message refused (in reply to end of DATA command)>

i have checked DNS, the internet email autoprotect on the antivirus is  disabled, we are running symantec mail security and there is no entry for that particular domain to blocked in any way, we are not on any blacklist nor is the external user
pls help
Question by:FM089
    LVL 2

    Expert Comment


    Looks like your symantic mail security is bouncing the message back, prob because of the attachments or content.

    Check your e-mail control settings
    LVL 5

    Expert Comment

    In Symantec Mail Security - you can goto into :

                - Spam Prevention Settings
                         - Real Time Black Lists and White Lists

    In there you can put the company who is getting refused - on the Sender White List

    You can also go into the "Heuristic Anti Spam Engine" which is in the same place and see what boxes are ticked - you might have a box ticked next to "Reject if SCL is greater than"  ... If this SCL Value is set too low it might be rejecting the Email MEssages.

    Also Check the Event Log in "Statistics and Reports" which is in the Symantec Mail Security Console which may show the message being rejected and the reason behind it.


    Author Comment

    there is no attachement to those mail and if there was, symantec is configured to log any and/or send a report to the recipient
    the content of the mail or purely buisness our filter will only stop email such as pronographic and so on...and still there will be log/trace in our system
    LVL 5

    Accepted Solution

    Yes - but do you have the SPAM Filter turned on? because this could reject mail that isnt pornographic if it has a high enough SCL rating. What are your SPAM settings set to?
    LVL 6

    Assisted Solution

    Looks like you've checked the Symantec side of things out, and all looks ok.   Are you in touch with the IT department at the remote site?  I think the issue may be that one of you has a Cisco PIX Firewall with its Mailguard feature enabled.  Mailguard sanitises SMTP mails, and can screw around with the DATA command while doing so.  Check out:;en-us;320027

    Although I think the problem tends to be with the firewall on the receiving end, ie, you.  :)


    LVL 10

    Assisted Solution

    by:Walter Padrón
    Hi FM089,

    SMTP 550 5.7.1 unable to relay error

    I have no experience with Symantec Mail Security but if Exchange is bouncing the messages this can help
    Administration Tip: Resolving Nondelivery Reports Caused by 5.7.1 or 5.7.3 Errors


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