Email validation required when using the Copy external mail on all sent messages option
Users must validate their external email addresses whenever they use the Copy external mail on all sent messages option. This option is selected in either Email Settings or the Account Settings > Email tab

Figure: Users can configure the Copy external mail on all sent messages option in the Account Settings > Email tab.

Figure: Once you have an external email address configured, the text of the option changes to Send a copy of each outgoing message to [external email].

Figure: Users can also configure the Copy external mail on all sent messages option in Email Settings. The text in this location also changes to Send a copy of each outgoing message to [external email].
Once users save their changes, the system sends a validation email message to the external email address. Users click the link in the email to validate the setting and email address. Unverified email addresses display a Not Verified - Click to Resend Verification Email status next to the Send a copy of each outgoing message to [external email] option. Users can resend validation emails, but the system does not copy messages to the external email address until it verifies the address. If users change their external email address, they must repeat the validation process.
Once users save their changes, the system sends a validation email message to the external email address. Users click the link in the email to validate the setting and email address. Unverified email addresses display a Not Verified - Click to Resend Verification Email status next to the Send a copy of each outgoing message to [external email] option. Users can resend validation emails, but the system does not copy messages to the external email address until it verifies the address. If users change their external email address, they must repeat the validation process.
Previously, Copy external mail on all sent messages did not require validation of external email. Any users who have previously configured Copy external mail on all sent messages do not require validation unless their external email address is altered.