Task 'firstname.lastname@example.org - Sending' reported error (0x80042109) : 'Outlook cannot connect to your outgoing (SMTP) email server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'
This error is common on most outgong mails from Microsoft Outlook.
You may try the following steps:
You may refer to this link for the email settings: Email Settings
Let us know how it goes.