Hi. I have a very annoying yet seemingly simple problem that I can't figure out. I have a 1and1.com business linux account and I use PHP heavily on the site. I can't get the mail() function to email more than 10240 characters. If the email 'message' contains 10241 characters in the string then the email doesn't ever send. If I send 10240 or less characters then it alwasy sends ok. I've also used PHPMailer quite a bit and it produces the same results. Here is the simple code below I use to test... only the top mail() will send out. This problem is drving me mad, it seems like a 1and1 problem but I've called them several times with no help.

<?php

for( $i=0; $i<10240; $i++ )
{
$body .= "X";
}

//I RECEIVE THE EMAIL WITH 10240 CHARACTERS
mail("craigjohnsonaz@yahoo.com", "10240 Characters", $body, "To: The
Receiver <craigjohnsonaz@yahoo.com>\n" . "From: The Sender <craigjohnsonaz@yahoo.com>\n" . "MIME-Version: 1.0\n" . "Content-type: text/html; charset=iso-8859-1");

$body .= "X";

//I RECEIVE NO EMAIL WITH 10241 CHARACTERS
mail("craigjohnsonaz@yahoo.com", "10241 Characters", $body, "To: The Receiver <craigjohnsonaz@yahoo.com>\n" . "From: The Sender <craigjohnsonaz@yahoo.com>\n" . "MIME-Version: 1.0\n" . "Content-type: text/html; charset=iso-8859-1");

?>

It seems like they have body size limit on their MTA, you cannot do anything with it on your side. You may use phpmailer sending though external smtp using login and password, e.g. gmail, but only if sockets are enabled on your server.

Yea, I figured that. Bummer. I have been trying for 2 days to get that PHPMailer to work with smtp with no luck. Then last night I replaced smtp.1and1.com with 74.208.5.2 and it worked!!! I can send huge emails now. Actually the 10240 size limit seems big, but when you start trying to send html emails it gets used up very quick.

Seeing as how you are using the mail() function to send mail to yourself from it appears a script on your site, you hopefully have some kind of security feature installed on the submit button to prevent mass emails?