You are using office365 and you getting the error message because somewhere in your website something is overriding the email you
defined to send emails inside the plugin.

For example:
You configured in the plugin to use the address this address always needs to be in the “From” field of the outgoing emails, and somewhere else you have a different address defined.

Possible solutions:
1. find the address and change it to the one you used in the plugin.
2. Block changes from external places inside the plugin:

3. Use this code inside your theme functions.php file:


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