550 5.1.1 No such user h34si1677928wxd

Posted on 2007-08-01
Last Modified: 2013-12-17
If I try to email from my or domain I get the below undeliverable message.  However I can email that address and get a reply from the recipient using AOL or Yahoo.
Unknown user:
RCPT TO generated following response:
550 5.1.1 No such user h34si1677928wxd
We use Ipswitch Imail.  2 versions  Imail 8.22 and Imail 2006.21
Thank you.
Question by:Cendyn2007
    LVL 5

    Expert Comment

    try to put the domain name you try tpo send mail to to the white list of your antispam product
    LVL 2

    Expert Comment

    Which Server is generating the report ? Please add full NDR (w/o) email address.

    Author Comment

    Thank you. It turned out that the domain we were sending to did not have their MX records set up correctly.  Their primary mx record was resolving to an IP address and not an A record..
    As they did not want to fix this I had to add all their 6 mx records and addresses to our hosts file and then we were able to send successfully.
    LVL 1

    Accepted Solution

    PAQed with points refunded (500)

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