Permanent failure when sending mail using mailgun - laravel

Question

I have a mailgun account I use to send mails on my site (domain.com) when someone signup, I then created another site on my subdomain (subdomainname.domain.com). However when I try to send mail from the subdomain site (subdomainname.domain.com) I get a permanent failure log in my mailgun account, and the email is not delivered. Please how can I solve this issue ? The mails sent from the main domain (domain.com) is delivered successfully.
The errors I get are :
02:13 PM Failed: postmaster#mg.agroexpresslink.com → ewomaukah#outlook.com 'Witskids:Activate Your Account' Server response: 550 550 5.7.0 (COL004-MC2F27) Unfortunately, messages from (209.61.151.224) on behalf of (yahoo.com) could not be delivered due to domain owner policy restrictions.
01/26/17 08:00 AM Failed: postmaster#mg.agroexpresslink.com → ewomaukah#gmail.com 'Witskids:Activate Your Account' Server response: 550 550 5.7.1 Unauthenticated email from yahoo.com is not accepted due to domain's 5.7.1 DMARC policy. Please contact the administrator of yahoo.com domain if 5.7.1 this was a legitimate mail. Please visit 5.7.1 https://support.google.com/mail/answer/2451690 to learn about the 5.7.1 DMARC initiative. d72si348434oic.133 - gsmtp
01/25/17 02:02 PM Failed: postmaster#mg.agroexpresslink.com → ewomaukah#yahoo.com 'Witskids:Activate Your Account' Server response: 554 554 5.7.9 Message not accepted for policy reasons. See https://help.yahoo.com/kb/postmaster/SLN7253.html

Answer 1

I found the solution to the problem, I changed the sender email from 'ewomaukah#yahoo.com' :
\Mail::send($view ,$data,function($message) use($user, $subject, $email){
$message->from('ewomaukah#yahoo.com','witskids');
$message->to($email, $user->firstname );
$message->subject( $subject);
});
To my domain :
\Mail::send($view ,$data,function($message) use($user, $subject, $email){
$message->from('noreply#agroexpresslink.com','witskids');
$message->to($email, $user->firstname );
$message->subject( $subject);
});