### Added:
- New plugin Setup Wizard.
- One click plugin upgrade (Lite to Pro).
- New Amazon SES regions: North California, Paris, Stockholm.
- Ability to clear error notices in multisite setups with plugin options editable network-wide.
- SendGrid Invalid API key error message and mitigation steps on the Email Test page.
### Fixed:
- Plugin settings overwriting checkboxes with default values when network-wide option is enabled on Multisite installation.
- Unused Return Path option removed for the Amazon SES mailer.
- Zoho mailer error when "reply-to" header was set to the Zoho authorized email address.
- Outlook mailer not sending emails with custom email headers missing prepended 'X-'.
- Email Log: Save correct sent date/time (UTC).
- License type text displayed in plugin settings.
- PHP fatal error on undefined Pro mailer object when switching to Lite version.
- PHP warning in Sendinblue email sent verification task.
- PHP 8 support.
