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Problems Sending Email to Specific Address

We are having a problem sending to one company. We are getting the following error back
The following recipient(s) could not be reached:
      frappazzo@saturnohogar.com on 10/08/2007 01:11 p.m.
            The format of the e-mail address is incorrect.  Check the address, look up the recipient in the Address Book, or contact the recipient directly to find out the correct address.
            < mx2.bfmlym.com #5.1.3 SMTP; 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.5.3 - chkuser)>


The following recipient(s) could not be reached:

      patricio.tiddens@telmex.com on 06/08/2007 04:37 p.m.
            The mail protocol was unable to handle one or more requests because they were unrecognized or invalid. Please notify your system administrator.
            < mx2.bfmlym.com #5.5.4 SMTP; 501 #5.1.1 bad address patricio.tiddens@telmex.com>
1 Solution
Both of those errors are not Exchange errors.
The second one means what it says - the email address is not recognised by the server the message is being sent to.
The first one is an indication that the remote site is blocking your message. You will need to contact them to find out why.

pretty straight forward error.  it is saying that the address it is presumably responsible for doesnt exist.  more specifically it doesnt know what "telmex.com" is and as far as the receiving server is concerned it isnt responsible for delivering mail to it.

try sending to that same address from a gmail account and you should receive the same error back.

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