You can prevent prospects from submitting invalid or unrelated email addresses through your forms by selecting email validation options at form level (per form basis change).

  1. When editing a form (Marketing > Forms > Create/Edit a Form) on Step 2, Fields, hover next to the Email field and click the pencil icon to edit its properties.
  2. In the window that pops-up, under the Basic tab, click the Data Format drop down menu and select:

    Email with valid mail server‘ to require

    • valid email address syntax
    • live domain name
    • receiving email server listed in DNS records

    or
    Email not from ISPs and free email providers‘ to require

    • valid email address syntax
    • live domain name
    • receiving email server listed in DNS records
    • not from a known free ISP (e.g., Comcast, Charter)
    • not from a free email provider (e.g., Hotmail, Gmail, Yahoo!Mail)
  3. Once you have selected the desired Data Format you can edit the Error Message field (under the Advanced tab of the Form Field edit screen) to be more specific for your validation type (e.g., Please provide a valid email address or Please provide a valid email address from your business or organization).
  4. When finished, click Save form field.

These edits are made on a per form basis so you can set up different email validation for each form, or set the same email validation on all forms.
Not what you’re looking for? Check out these other articles:
Setting Up Confirmed Opt-In Process
What makes an email address valid?