The email messaging queue "places" emails into a queue table called Messaging.EmailQueue. You can query this table easily with database access - for example:
select top 100 * from messaging.emailqueue order by 1 desc
This shows the data within that table and can be helpful to review via SQL for development purposes. The same data is also available within the admin dashboard as well.
In order to set up/manage the emails that send out, you can manage the email templates' location within the AppSettings.config file which has the following email settings (note that there are many other settings as well):
<add key="Clarity.Emails.Defaults.CompanyName" value="Company Name" />
<add key="Clarity.Emails.Defaults.From" value="customersupport@email.com" />
<add key="Clarity.Emails.Defaults.BackOfficeEmail" value="customersupport@email.com" />
<add key="Clarity.Emails.Defaults.To" value="" />
<add key="Clarity.Emails.Defaults.CC" value="" />
<add key="Clarity.Emails.Defaults.BCC" value="email@email.com,email2@email.com" />
<add key="Clarity.Emails.Defaults.Subject" value="An Email from {{CompanyName}}" />
<add key="Clarity.Emails.Defaults.RequiresHttps" value="true" />
<add key="Clarity.Emails.Defaults.LoadFromSeparateDomain" value="true" />
<add key="Clarity.Emails.Defaults.ReturnPath" value="/" />
<!-- <add key="Clarity.Emails.Defaults.TemplatesRoot" value="/Portals/_default/Skins/Client/Ecommerce/Email/" /> -->
<!-- <add key="Clarity.Emails.Defaults.TemplatesRoot" value="/Portals/_default/Skins/Clarity/Ecommerce/Email/" /> -->
<add key="Clarity.Emails.Defaults.TemplatesRoot" value="https://api.email.com/Email/" />
Note that the email templates root can be a relative file path or a URL to a "root" domain (note that additional setting for the "LoadFromSeparateDomain" has to be true for another domain to be used). From there the other settings for the emails are appended to the end of the templates root.
In addition, it's possible to modify the email addresses that the emails come from and CC/BCC to for all emails as well as on an individual email level. You can also have more than one email in these settings and they would need to be separated by commas as shown in the example above.