Website Emailer Goes Through To All Types Of Email Addresses Except Yahoo

Hey, I have a website that uses a php automatic emailer to email members. Every time it tries to send out an email to somebody with a yahoo email address, it never makes it to their inbox or spam folder. I know it has to be something to do with yahoo mailboxes because the email is successfully received by the following other types of email addresses: oh.rr.com, gmail.com, hotmail.com, atcmg.com, platinumre.com, polhemusweb.com, embarqmail.com, woh.rr.com, my.erau.edu, drs.com, bellsouth.net, and aol.com. Note: The "echo 'sent!'" is called when sending to the yahoo accounts. Here is the php snippet: $subject="Your Activation Code"; $phpfrom="[email protected]"; $phpheaders = "From: Lambda Chi Alpha Admin <" . $phpfrom . ">"; $message="Click the link to activate your account.\r\n http://*****.com\r\nAdministration"; $sent=mail($_POST['email'],$subject,$message,$phpheaders,'-f' . $phpfrom . ''); if($sent) { echo "sent!"; } else { echo "not sent!"; }

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General Preferences | Yahoo! Mail Classic Help
You can customize the following ways to sort your Inbox or folder. email go to a different address than this box to be enhanced with friends and family where you can customize how you view, send, and receive Yahoo! When sending messages: If you want replies to your email to go to your Yahoo! Compose messages as Rich Text ) when writing...
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...;Deliver to : You can make the following changes: Deliver to :" Note: When "Use filters" Then your disposable addresses. column). Select the one of your Inbox to get to your Spam folder. If you want to receive all messages sent to this disposable address in the folder you want , you could send those messages to a folder called "Auctions." and...
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