Hola, yo utilizo el siguiente codigo y de momento 'toquemos madera' no tengo problemas.
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$p_a_r_a = "
[email protected] ";
$h_e_a = "MIME-Version: 1.0\r\n";
$h_e_a .="Content-Type: text/html;charset=Windows-1252 Content-Transfer-Encoding: quoted-printable<br>";
$h_e_a .= "From: ".$p_a_ra."<br>";
$h_e_a .= "Reply-To: "$p_a_r_a."<br>";
$h_e_a .="Disposition-Notification-To: ".$p_a_r_a."<br>";
$h_e_a .= "Cc: ".$p_a_r_a2"."<br>";
$h_e_a .= "Bcc: ".$p_a_r_a3"."<br>";
$a_s_u_n ="ASUNTO";
$c_o_s= '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">';
$c_o_s .='<HTML><HEAD>';
$c_o_s .='<META http-equiv=3DContent-Type content=3D"text/html; =charset=3Dwindows-1252">';
$c_o_s .='<META content=3D"MSHTML 6.00.2800.1226" name=3DGENERATOR>';
$c_o_s .='<STYLE></STYLE>';
$c_o_s .='</HEAD>';
$c_o_s .='<BODY bgColor=3D#ffffff>';
//***************** Aqui mandamos *******************
mail($p_a_r_a,$a_s_u_n,$c_o_s,$h_e_a);
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