Misconfigured "Email To" address

I feel awfully stupid, but I just don’t succeed at entering valid multiple “Email To” addresses.

When I enter:

someone@mydomain.com;someone2@mydomain.com

I get:

ERROR: Misconfigured “Email To” address.

DNS checking is disabled. E-mails are sent through Amazon SES.

Any suggestions?

Thanks!

https://wordpress.org/plugins/si-contact-form/