We are sending authentication email in every registration process in our website: www.fabuloush.com and i saw that we get an approximate of 10 registers. But I've also noticed that we get a lot of bounced emails on this. Here is an example of what we get: Could not deliver message to the following recipient(s): Failed Recipient: email@example.com Reason: Remote host said: 554 delivery error: dd This user doesn't have a yahoo.com account (firstname.lastname@example.org) [-5] - mta208.mail.re2.yahoo.com -- The header and top 20 lines of the message follows -- Received: from DEDE68 [18.104.22.168] by mail.fabuloush.com with SMTP; Tue, 8 Nov 2005 02:34:04 -0700 thread-index: AcXkR47u2PUfWDJLSBi3btcg3P3w2Q== Thread-Topic: FABULOUSH.com EMAIL CONFIRMATION From: <email@example.com> To: <firstname.lastname@example.org> Subject: FABULOUSH.com EMAIL CONFIRMATION Date: Tue, 8 Nov 2005 02:34:04 -0700 Message-ID: <000601c5e447$8eee25b0$4552c8d1@DEDE68> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C5E40C.E28F4DB0" X-Mailer: Microsoft CDO for Windows 2000 Content-Class: urn:content-classes:message Importance: normal Priority: normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.1830 This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C5E40C.E28F4DB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit <http://www.fabuloush.com/images/email_03.gif> <http://www.fabuloush.com/images/email_04.gif> Fabuloush.com Email Confirmation Hi mark lajeras, Thank you for registering to Fabuloush.com, you are now just one step from using our fabulous features such as: What could be the problem? Is there something I forgot to configure?