Receiving Spammy Email

Has anyone gotten several spam emails lately from the contact form? Just trying to feel out every possibility. I am not having a problem with my site, but one of my customers (and I use your form on all the sites) is… He’s getting 7-10 spam email a day for the last 5 days or so. He’s changed his pw and everything is up-to-date on the website (plugins, latest WP version). Do you have any thoughts? I know they are def coming from his website form because they are saying “This mail is sent via contact form on hiswebsite.com” Thanks for the help in advance!!

https://ww.wp.xz.cn/plugins/contact-form-7/