Contact form had errors about sending email, but my wordpress email worked

Hi

The problem I met with the contact form is that, when I filled the form and submitted, it said “Error sending email, please try again later.”

I have looked up this forum about these similar problems, and tried all the methods you provided, such as stop the other plug-in, changed back to the default theme or examine the wordpress email setting. However, they all did not work.

Besides, my wordpress could send email properly. I used the WP-Mail-SMTP plugin to send all emails via SMTP.

Can you help me with this problem. Thanks a lot.

Amy