Zoho doesn't receive emails sent from PHP

Zoho doesn't receive emails sent from PHP

Hi,

I have succesfully set up my Zoho account, with my own domain (firmatverkkoon.fi). I updated the MX records, and I can now send and receive email from my new email address (tuomas@fir...).

Then I tried to make a contact form using PHP, to my website. The contact form works, but when I config it to send email to my new email address, the messages don't reach my mailbox. If I config the form to send email to my other address (on Outlook), everything works fine.

I found some email logs from my web hosting cPanel, and there is this message: "Remote host closed connection in response to initial connection". Why Zoho doesn't receive the emails that are sent by my PHP script?

Thank you for any help,
Tuomas
Finland