Using Reply-To: [your-email] will cause error

More tests shows that if using a free email such as @outlook.com as the [your-email], then send will fail. But with a business email such as @mycompany.com, then send will succeed.

It seems to be an anti-spam function, to prevent the free email adress from sending spam emails. Then how to disable such a feature?

Where can we see the website in question?

@takayukister

You can see it at https://www.datanumen.com/contact/

With a test email of [email protected], you will succeed.

However, with a test email of [email protected], you will fail.

See Setting up mail

What email settings do you have in the Mail tab panel?

To protect personal data, hiding email addresses in the settings or replacing them with dummy addresses is strongly advised. You can also include screenshots.

Hi, @takayukister

I have uploaded the screenshot:

Thank you very much.

What if you remove the Reply-To header line?

Hi, @takayukister

Then I will be able to send message via either [email protected] or [email protected].

What other plugins and theme do you use on the site?

Hi, @takayukister

I have tested on a site with default WP theme and no other plugins. I find out the trick.

If setting “To” to an email with different domain instead @example.com, for example, I use @example.org, then the send will fail.

Obviously this is also a anti-spam policy, just wonder how to change that, as @example.com and @example.org are both our domains.

Hi, @takayukister

I find a workaround. I set the form to send email to @example.com, and then use @example.org to receive emails from @example.com, and then everything is OK now.

Thank you for your attention.