关于php发送mail的问题，急切想知道，请大家多多关注！

Question

除了用MAIL（）还可以采用调用邮件服务器上的sendmail的命令来实现！

Answer 1

<?
/*
 * email_validation.php
 *
 * @(#) $Header: /cvsroot/PHPlibrary/email_validation.php,v 1.4 1999/11/02 06:19:35 mlemos Exp $
 *
 */class email_validation_class
{
 var $email_regular_expression="^([a-z0-9_]|\\-|\\.)+@(([a-z0-9_]|\\-)+\\.)+[a-z]{2,4}";
 var $timeout=0;
 var $localhost="";
 var $localuser=""; Function GetLine($connection)
 {
  for($line="";;)
  {
   if(feof($connection))
    return(0);
   $line.=fgets($connection,100);
   $length=strlen($line);
   if($length>=2
   && substr($line,$length-2,2)=="\r\n")
    return(substr($line,0,$length-2));
  }
 } Function PutLine($connection,$line)
 {
  return(fputs($connection,"$line\r\n"));
 } Function ValidateEmailAddress($email)
 {
  return(eregi($this->email_regular_expression,$email)!=0);
 } Function ValidateEmailHost($email,$hosts=0)
 {
  if(!$this->ValidateEmailAddress($email))
   return(0);
  $user=strtok($email,"@");
  $domain=strtok("");
  if(GetMXRR($domain,&$hosts,&$weights))
  {
   $mxhosts=array();
   for($host=0;$host<count($hosts);$host++)
    $mxhosts[$weights[$host]]=$hosts[$host];
   KSort($mxhosts);
   for(Reset($mxhosts),$host=0;$host<count($mxhosts);Next($mxhosts),$host++)
    $hosts[$host]=$mxhosts[Key($mxhosts)];
  }
  else
  {
   $hosts=array();
   if(strcmp(@gethostbyname($domain),$domain)!=0)
    $hosts[]=$domain;
  }
  return(count($hosts)!=0);
 } Function VerifyResultLines($connection,$code)
 {
  while(($line=$this->GetLine($connection)))
  {
   if(!strcmp(strtok($line," "),$code))
    return(1);
   if(strcmp(strtok($line,"-"),$code))
    return(0);
  }
  return(-1);
 } Function ValidateEmailBox($email)
 {
  if(!$this->ValidateEmailHost($email,&$hosts))
   return(0);
  if(!strcmp($localhost=$this->localhost,"")
  && !strcmp($localhost=getenv("SERVER_NAME"),"")
  && !strcmp($localhost=getenv("HOST"),""))
     $localhost="localhost";
  if(!strcmp($localuser=$this->localuser,"")
  && !strcmp($localuser=getenv("USERNAME"),"")
  && !strcmp($localuser=getenv("USER"),""))
     $localuser="root";
  for($host=0;$host<count($hosts);$host++)
  {
   if(($connection=($this->timeout ? fsockopen($hosts[$host],25,&$errno,&$error,$this->timeout) : fsockopen($hosts[$host],25))))
   {
    if($this->VerifyResultLines($connection,"220")>0
    && $this->PutLine($connection,"HELO $localhost")
    && $this->VerifyResultLines($connection,"250")>0
    && $this->PutLine($connection,"MAIL FROM: <$localuser@$localhost>")
    && $this->VerifyResultLines($connection,"250")>0
    && $this->PutLine($connection,"RCPT TO: <$email>")
    && ($result=$this->VerifyResultLines($connection,"250"))>=0)
    {
     fclose($connection);
     return($result);
    }
    fclose($connection);
   }
  }
  return(-1);
 }
};?>
祝您好运！

Answer 2

可以的：
在PHP中有个函数叫：HTMLSpecialChars，用来把一些特殊的字符转换成HTML的格式
举个例子：
$Text=preg_replace("/\[url\](.+?)\[\/url\]/is","<a href=\\1>\\1</a>",$Text); 
这是一个支持连接的语句，当然你可以定义很多这样的HTML，不过有点麻烦。:)

Answer 3

你只要把正文内容格式处理成MIME的邮件格式就行了。那样的话，你就可以发送有附件而且任何类型的邮件方式。