FluentSMTP Email Logs Feature
Email Logs is every message FluentSMTP recorded. It is a top-bar destination of its own. It is not buried under Settings.
Logging must be on. That switch is Log Emails on Settings. If it is off, the logs screen tells you and offers Turn On.

What you can do
- All / Sent / Failed: Failed is what you want after a support ticket about missing mail.
- Date range then Filter.
- Search logs: subject, recipient, and similar fields.
- Refresh.
- Click a Subject (or the view action) to open the message: body, headers, attachments, server response.
- Resend on a row, or bulk resend after selecting rows. Failed mail is the usual case. You can also resend something that already went out.
- Delete selected rows. There is a bulk delete as well.
Simulated messages are marked Simulated. They never left the site. See Email Simulation in Settings.
Reading a failure
Open the log. The red Why it failed line and the Server Response block are the provider's words, not a FluentSMTP invention.

"Email address is not verified" on SES is sandbox, or a From that SES has not verified in that region. 401 from Mailgun is a bad key. Use that text, not a guess.
Resend after you fix the cause (verify the domain, fix the key, leave sandbox). Resending the same broken config just writes another failed row.
Logs older than Delete Logs on Settings are gone. If you need a longer history, raise that number before the window closes.