We pass to telegram the email and our route in the field `callback_data` that is [limited to 64 bytes](https://core.telegram.org/bots/api#inlinekeyboardbutton) but the maximum lenght for a [email is 254 character](https://stackoverflow.com/a/574698)
We pass to telegram the email and our route in the field
callback_datathat is limited to 64 bytes but the maximum lenght for a email is 254 character