go-mailin8 is a command line utility I've created to get the most recent message from a Mailinator email inbox.
Mailinator is one of a number of free services that allows you to use a disposable email address. This is handy when you're signing up for something but when you know that the account or email is only needed ephemerally, as a one-off. My frequent use case is for free Bandcamp downloads that require an email address. It can also be useful for testing on the web, if you're developing something that sends email.
What using a disposable email address offers is not having to hand out your real email address when that's not needed, with the advantage of reducing the number of unwanted messages you receive. Yes, of course, you can usually unsubscribe from mailing lists, but that's extra work. Better to just not let the unwanted messages anywhere near your real inbox, where possible.
Can't you just visit the site?
Yes, you can. But I'm lazy, and this means switching to a new tab, visiting the URL and loading their home page, then entering the inbox address, loading the inbox page, and clicking the mail to display it and then finally copying the activation or download URL I'm looking for.
Much easier if I can just run a command line program that just takes the local-part of the mailbox name (the part before the @):
and gives me back the most recent message. Copy-pasting the URL directly from the terminal is then simple.
Why Go and not Python?
It would be probably have been easier to write in Python as I know that better than I do Go. But I'm conscious that I spent some time over the summer reading up on Go; the more chance to practise, the better.
In this case, features Go offers like being faster, and easier to write concurrent code aren't really important. You could equally well write this code in Python and it would be just as useful.
Where Go excels is that the code has no dependencies to install once it is compiled. Much simpler than telling someone to first install Python and then the packages that they need. (I realise that the target audience of such a tool are probably more than capable of doing so, but this reduces the barrier for someone to get the program running on their computer nonetheless.)