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Email address used by website but I do not know where

I build a website for a client. This client then filled the website with content. I created 20 contact forms, using the contactform 7 and WP Mail SMTP Pro plugin.
The website has now more than 100 pages.

First my email address was used for the sites admin. I changed this later to my clients email address. I also used the client his email address for all of the contact forms.

But now I still get a emails from the site, every now and again. When a visitor from the site used the site to email my client, either by contactform, or otherwise (I do not know exactly how). Instead of sending the email to my client, the email was send to my email address.

I want to change this, but do not know from what part of the website the emails are coming from. They are not coming from the contact forms, I changed the email addresses there.

Is there a way I can see what page the emails are coming from? The people who send the emails do not remember which part of the website they used when sending the emails.

Maybe there is a way to download all of the source code of the website?