Is there one dedicated email address for testing?

Yes, GlockApps supports the testing mode via one dedicated email address. These tests are called Smart Tests.

To use one dedicated address for email testing, you need to create a sending account with your SMTP settings in GlockApps (Inbox Insight > Sending Accounts), generate a proxy address in the sending account settings, and send the message to the proxy address.

GlockApps will create a test and re-send the message to the seed list via your email account. The test will be saved in Reports > Smart Tests.

This mode eliminates the need to create a test manually and copy-paste the id in the message. 

Here you can read more about email testing via one proxy email address.