Easily prepare multiple email addresses from one email address! Convenient ways to use Gmail

Hello.
I'm Nomushin, in charge of smartphones on the development team.

When developing an app/system, you may need multiple email addresses for testing, right?

There are services that allow you to easily create throwaway addresses, but
this time I'll show you a trick to easily create multiple addresses from one address using Gmail.

It's not a particularly new method, but if you don't know about it, please give it a try.

 

What to prepare

・Gmail address ×1

yes. That's all!

This time I will explain using
[email protected] If you send an email to this address, it will actually be delivered to Nomushin, but please refrain from sending prank emails.

 

Method 1: @googlemail.com

The Gmail address is " [email protected] ", but it can actually be delivered to "googlemail.com" .

If you send it to "[email protected] " it will be delivered to [email protected]

Now one email address has become two!

 

Method 2: Period growth method

Gmail ignores the period (also known as a dot) before the @ .

In other words, all emails sent to the address below will be delivered to [email protected]

• nomyuki.beyond @gmail.com
• nom.yuki.beyond @gmail.com
• [email protected]​

However, you cannot put two or more dots in a row, or put a dot just before @.
This means that " [email protected] " and " [email protected]

However, please note that this is not a restriction of Gmail, but a general rule (RFC) for email addresses.

You should be able to generate a lot of email addresses using this method...!

There is also a description of this period Gmail Help

 

Method 3: Plus append method (alias)

Even if you can increase the number of email addresses by adding dots, there is a limit!
For those who say...I will teach you the last method.

All you have to do is add "+ (plus) and any string" after your account .

, even if you specify an address such as "nomyukibeyond +nomurahaimatotemonemui.zzz , the email will be delivered to [email protected]

Do not pursue the added words too deeply.
...Don't do it.

This method allows you to generate an unlimited number of email addresses.

This account expansion using + is a function of Gmail's alias , which is used to add categories to addresses to make it easier to categorize emails.

 

By the way, methods 1 to 3 introduced so far can be used in combination .
"[email protected]" will also arrive properly.
...It's quite depressing.

 

Bonus: About email address rules

Is it okay to use + (plus) in email addresses? Some people may think so.
Based on the RFC definition that appeared in Method 2, it is ``OK to use.''

The original text of the RFC is long, so borrowing the description from Wikipedia

- Uppercase and lowercase Latin letters (Originally, uppercase and lowercase letters are distinguished, but in reality, most implementations do not. They are generally written in lowercase letters.)

・Numbers

・! # $ % & ' * + - / = ? ^ _ ` { | } ~(In reality, providers often limit the symbols that can be used to only some characters.)

・Period ( . ) (can be used other than at the beginning and end. Must not be 2 or more consecutive)

Regarding the uppercase and lowercase letters in the notes for uppercase and lowercase Latin letters (alphabetic characters), it seems that Gmail does not distinguish between uppercase and lowercase letters.
, even if you send it to "nomyuki BEYOND it will still arrive at [email protected]

Also, there are surprisingly many symbols that can be used.
However, as noted, although it is OK according to the RFC definition, there are many cases where restrictions are imposed by the provider who is actually responsible for sending and receiving emails, so it is best to use - _ . for It may be best to keep it at that.

 

summary

What do you think? If you know all the methods introduced this time, are you a Gmail expert?
If you dig deeper into Gmail, you'll find a lot of useful features.
It's no good just using it the same way as regular provider email!
If you are interested, it might be interesting to look into it.

lastly

I have opened the system development service site "SEKARAKU Lab" to which I belong.
Beyond is a one-stop service for everything from server design and construction to operation, so if you have any trouble with server-side development, please feel free to contact us.
SEKARAKU Lab: https://sekarakulab.beyondjapan.com/

See you soon!