title: mail () SMPT error (5050) sending failed 5.1.1) PHP
body: <p>I am having a problem that I have never encountered in my life.</p>
  <p>In practice we have a website where we receive reservations, the A record is pointed towards our vps for the management of the site instead the part of mail is managed by aruba since the customer has preferred to leave their mail client. (for a matter of convenience because they have been using it for some time)</p>
  <p>Going to the problem ..
  the php mail () function when trying to send an email to the email: info@dominio.it our server returns as an error:
  SMPT error (5050) sending failed 5.1.1)
  in practice it is as if the email does not exist and was looking for it on our server but in reality it is located on aruba.</p>
  <p>How can I tell the php mail () function to search for this mail not locally but on aruba?</p>
  <p>with regard
  Fabrizio C.</p>