More usefully, what did it do? I’m not hearing that it said nothing.
If no mail was tried, then the lines I posted would jump to below.
Basically, there are normally two statements on backup endings.
SendMail (if it runs) goes between them.
2025-01-20 07:43:14 -05 - [Information-Duplicati.Library.Modules.Builtin.SendMail-SendMailComplete]: Email sent successfully using server: smtp://smtp.gmail.com:587/?starttls=always
2025-01-20 07:43:14 -05 - [Information-Duplicati.Library.Main.Controller-CompletedOperation]: The operation Backup has completed
except without the SendMail stuff. If it tried SendMail and failed, you’d see that, so maybe it didn’t try, which could be due to the --send-mail-level double quoting. Also note that you requested that no mail be sent normally, so I hope you got at least a warning. What if you omit it or try all?
--send-mail-level (String): The messages to send
You can specify one of "Success", "Warning", "Error", "Fatal".
You can supply multiple options with a comma separator, e.g. "Success,Warning". The special value "All" is a shorthand for "Success,Warning,Error,Fatal" and will cause all backup operations to send an
email.
* values: Unknown, Success, Warning, Error, Fatal, All
* default value: all