Today’s email inboxes often have a high level of filtering which means that some of the emails that you send to clients unintentionally go into their Spam folder.
To reduce the risk of this happening we have added an SPF (Sender Policy Framework) DNS record to all our CPHT Websites client domains. SPF is an email-authentication technique that notifies all recipient inboxes that the sender is a trustworthy IONOS domain and not Spam.
This measure should minimise the risk of your emails going into clients’ Spam folders.
Another solution is to add a Telephone field to your website Contact form. In this way you can call your client afterwards to make sure they have received your email. Let me know if you wish have a Telephone field on your Contact form and I will add it in.