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We use a Go app called MailHog, which is a SMTP server for development use. It also has a web interface for management. All in a single go file (SMTP server, HTTP server, plus all web artifacts). That is a pretty convenient packaging for a dev/staging tool.

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Do you mean a single binary file? MailHog's mail.go file pulls in a number of dependencies that round out its HTTP and SMTP servers. In OP's case, the entire project's source code is in the main.go file.

Yes, a single binary file is what I meant. I realize in some ways it is orthogonal here, but I guess it reminded me that sometimes a single file can be useful in surprising ways...

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