553 Relaying Disallowed using phpmailer

553 Relaying Disallowed using phpmailer

Hello!

I have a contact form on my site aktechnologies.net/contact.html, but when someone fill that form and submit it it shows the following error:

2021-07-10 11:07:57 SERVER -> CLIENT: 553 Relaying disallowed as <any email address here which user put on form>
2021-07-10 11:07:57 SMTP ERROR: DATA END command failed: 553 Relaying disallowed as <any email address here which user put on form>
SMTP Error: data not accepted.
Error in sending email. Mailer Error: SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: Relaying disallowed as <any email address here which user put on form> SMTP code: 553 2021-07-10