style: gofmt format files

[ScriptBloom]

I have notice some .go files are not formated, so I create a PR to format the file with gofmt tool.

In email.go file end, add a line break. It's useful to keep consistent style and cross-platform compatibility.

Thanks for reviewing.

[danenania]

Thanks @ScriptBloom, I need to configure VSCode to run gofmt after prettier before merging this or else it's just going to remove the line break again.