Sending emails using Apple's SMTP service for icloud.com or me.com email accounts.
Posted by Sinclair Hughes on 28 April 2021 08:08 AM

If you are using Apple's icloud.com or me.com SMTP service to send emails from Incisive applications, you will need to create an 'App-Specific' password to use for the Authentication password.

In Apple's words "App-specific passwords are passwords for your Apple ID that let you sign in to your account and securely access the information you store in iCloud from a third-party app. For example, use app-specific passwords with mail, contacts, and calendar services not provided by Apple."

https://support.apple.com/en-us/HT204397

If you follow the links in the above page and log into your apple account you can find the option to Generate Password...  for App-Specific Passwords.

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You can have up to 25 App-Specific passwords.

The SMTP settings you need to use are available for your icloud.com or me.com email address from the following URL

https://support.apple.com/mail-settings-lookup