Keep the From Address on Your Own Domain
When a plugin sends email "from" a visitor's or a free webmail address, switches the From to your own domain and keeps the original address as Reply-To, so emails pass SPF and DMARC checks.
Snippet Library
Email snippets for WordPress
Snippets for the emails WordPress sends: change the sender name and address, add a Reply-To header, send HTML email and turn off notifications you do not need. For site owners who want their messages to arrive and look right.