https://www.labnol.org/internet/one-email-for-multiple-twitter-accounts/9492/
Link Multiple Twitter Accounts with 1 Email
There’s however a simple workaround that will let you use the same email address with all your Twitter handles - the only condition is that you should be using a Gmail or Google Apps email address.
In Gmail, you can add a dot (.) anywhere in the username and all emails address to that new alias will still reach your mailbox. For instance, if your original email address is hello@gmail.com, any emails sent to he.llo@gmail.com or he.ll.o@gmail.com will land in your mailbox because Gmails ignores periods in the email username.
And that’s what you can use to trick Twitter. Twitter will consider hello@gmail and he.llo@gmail as two separate and valid email addresses even though they point to the same Gmail Inbox.
Update: Please do that note that you have to enable the catch-all option in your domain setting to use email aliases inside Google Apps. Thus it is a better option to use a free Gmail address for Twitter.