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Home/ Questions/Q 7786877
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Editorial Team
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Editorial Team
Asked: June 1, 20262026-06-01T20:30:01+00:00 2026-06-01T20:30:01+00:00

hi i get this error when i try to send email SMTP -> ERROR:

  • 0

hi i get this error when i try to send email

SMTP -> ERROR: MAIL not accepted from server: 501 : sender address must contain a domain 

it used to work fine i’m not sure what happend
i use php mailer but i dont think this is important

   $smtp = setting::get_smtp( 1 , 'support');      

   $mail   = new PHPMailer(); 
   $mail->IsSMTP(); 
   $mail->Host       = $smtp->address;  //localhost
   $mail->CharSet    = "utf-8";                              
   $mail->SMTPAuth   = true;                 
   $mail->Port       = $smtp->port;    // 25                  
   $mail->Username   = $smtp->username; 
   $mail->Password   = $smtp->password;   
   $mail->From       =  $smtp->from ; // www.mysite.com
   $mail->AddReplyTo ($smtp->username , $smtp->from ); // noreply@mysite.com //www.mysite.com
   $mail->Subject    = $title;
   $mail->AltBody    = "To view the message, please use an HTML compatible email viewer!"; 

       $mail->MsgHTML($msg);
       $mail->SMTPDebug = 1;
       if( filter_var( $admin_email , FILTER_VALIDATE_EMAIL ) == TRUE ){
       $mail->AddAddress($admin_email , "John Doe");
           $mail->Send();
       }
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  1. Editorial Team
    Editorial Team
    2026-06-01T20:30:02+00:00Added an answer on June 1, 2026 at 8:30 pm

    The error message is a bit misleading, but the problem is clear. The From: header must contain a domain as a complete email address. If your $smtp->from contains www.mysite.com, that is an invalid email address, missing the part after @. The mailer misinterprets your domain name as only the first part of an email address (the user part) and complains that it needs @domain to go with it. Supply a full sender email address to your $smtp->from property.

     // Should be something like sender@example.com
     $mail->From       =  $smtp->from ; 
    
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