title: Yahoo mail rejects my mails - Error 554 Message not allowed
body: <p>I need some help with a problem I'm facing with Yahoo mail. To summarize, here's my situation:</p>
  
  <p>I have a simple e-commerce site with some users signed up. Some of them, uses Yahoo mail. When they buy an item, an email is automatically sent to them with the purchase details and a link to: <a href="https://example.com/item/item_id" rel="nofollow noreferrer">https://example.com/item/item_id</a>.</p>
  
  <p>I used outgoing SMTP GMail server. The problem: Yahoo (only Yahoo) is rejecting my emails. The reason: <strong>"554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit <a href="https://help.yahoo.com/kb/postmaster/SLN5067.html" rel="nofollow noreferrer">https://help.yahoo.com/kb/postmaster/SLN5067.html</a> [120]"</strong>. I have this same issue if I try to send an email with a link to my site even directly from a Yahoo mail.</p>
  
  <p>Searching in Yahoo forums, I found <a href="https://forums.yahoo.net/t5/Temporary-Errors/Error-554/td-p/127237" rel="nofollow noreferrer">this post</a>, in which the user who ask, has the same problem, but the moderator of the site gives a solution that (to me) doesn't make much more sense.</p>
  
  <p>Does anyone have an idea of what can I do? I need to be able to send mails because I'm in production and I need this mails.</p>
  
  <p>I will be so gracefully for your help!</p>
  
  <p>Regards!</p>