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Recently one of developer of my team had an Google email as

developer-his.user.name@gmail.com

while I know about sub-addressing as

his.user.name+label@gmail.com

What is that called and how is that important?

Update: I have read Google docs and I could search about + sign in the ID, which is being used for filtering purpose. Where can I find more about dash.

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    A dash is a legal character in an email address. Whether Gmail treats it like the period and ignores it, I do not know. – jonsca Mar 26 '17 at 7:36
  • Oh! it mean if I have email@gmail.com I can use e-m+a-i+l@gmail.com or so? – Vishal Kumar Sahu Mar 26 '17 at 9:07
  • I read many docs and every where it was mentioned :D But I could not connect to the point that he may be using dash to make his id fancy... – Vishal Kumar Sahu Mar 26 '17 at 9:08
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Google does not allow dashes in new email addresses, but they might have in the past as @ale said. Either way, it is not like the . or + characters and is a permanent part of the address. For example, if my email address is testemail@gmail.com, you can't send an email to test-email@gmail.com and have it arrive in my inbox. The opposite is also true. So, developer-his.user.name@gmail.com is the email that person signed up with and you can't send an email to him by using his.user.name@gmail.com.

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  • Please use only letters (a-z), numbers, and periods. When I use - in creating gmail account. Then how come that guy got that? – Vishal Kumar Sahu Mar 27 '17 at 8:22
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    @Vishal: Perhaps he got that account before Gmail tightened up the username requirements. – ale Mar 27 '17 at 13:09
  • Your answer is somewhat convincing... :) @ale – Vishal Kumar Sahu Mar 27 '17 at 13:36
  • Dashes are allowed in Gmail if you have a business (or whatever it's called) account. – Alexej Magura Nov 6 '19 at 19:23
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The decision by Google to allow or not allow the dash in new email addresses they create is a Gmail policy. The dash is considered legal character so they and all other email systems will still send and receive emails that use the dash.

Because the plus and the period are also legal characters in email addresses all email systems will send and receive emails that use them. The Gmail spin on the rules says that they will not assign user names that only differ by the inclusion of periods, and that things after the plus are not important. That spin on the rules allows you to use the + as a filter.

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