Big Dan said:This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
tristanclark@sbcglobal.net
SMTP error from remote mail server after RCPT TO:<tristanclark@sbcglobal.net>:
host sbcmx1.prodigy.net [207.115.21.20]: 553 5.3.0 <tristanclark@sbcglobal.net>... Addressee unknown, relay=[207.58.188.133]
Hello,
This appears to be a standard user unknown error and not a blacklisting issue.
Are you sure the e-mail address was typed correctly?
If yes, and a second try fails..
I'd recommend calling the contact to get their current e-mail address, trying an alternate address, or if this is from a mailing list removing the invalid address from your list, whichever is most appropriate.
-Raymond