This repo is a golang port of JS library: https://github.com/iDoRecall/email-normalize

normalize-email normalizes email addresses to their canonical form.

• remove dots in GMail or email addresses hosted by similar services (Google Apps for Work, FastMail)
• remove address tags starting with '+', or '-' for Yahoo!, or '=' as well if desired
• converts alias domains to the canonical one, e.g. googlemail.com to gmail

• gmail.com, googlemail.com and google.com - the only domains Google is known to use for incoming email
• Any domain hosted with Google Apps for Work
• FastMail and domains hosted with FastMail
• Microsoft's outlook.com, hotmail.com, live.com
• Yahoo! domains

		// Gmail dots
		"[email protected]": "[email protected]",
		"[email protected]": "[email protected]",

		// Google domains
		"[email protected]": "[email protected]",

		// Plus
		"[email protected]": "[email protected]",
		"[email protected]": "[email protected]",

		// Non-standard TLDs
		"[email protected]": "[email protected]",

		// Yahoo!
		"[email protected]": "[email protected]",
		"[email protected]":   "[email protected]",
		"[email protected]": "[email protected]",
		"[email protected]":    "[email protected]",

		// Microsoft
		"[email protected]":   "[email protected]",
		"[email protected]":   "[email protected]",
		"[email protected]": "[email protected]",
		"[email protected]":        "[email protected]",

		// Google Apps for Work
		"[email protected]": "[email protected]",

sync version

    ... 
    rawEmail := "[email protected]
    normEmail := normalize_email.Normalize(rawEmail, nil, nil)

    // normEmail == "[email protected]"
    ...

async version for detect provider

    ... 
    callback = make(chan string)
    ... 
    rawEmail := "[email protected]
    _ := normalize_email.Normalize(rawEmail, &Option{DetectProvider: true}, callback)
    ... 
    normEmail := <- callback

    // normEmail == "[email protected]"
    ...

Please also refer normalize_test.go for examples.

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