As you probably have noticed, the SMTP module was replaced by “Email – SMTP Connector” and “Email – SMTP API” apps in the Business Central 20 version and will cause an error if you use the standard SMTP module. Read the latest post on the Simplanova blog, where you will find possible SMTP mailing usages and learn how you can rework the old functionality. Full article here:
https://simplanova.com/blog/how-to-create-and-send-an-email-message-in-business-central-20-using-replaced-smtp-module/