Allow Emails to be 254 characters long.

app/auth/forms.py

 from flask_wtf import FlaskForm
-from wtforms import StringField, PasswordField, BooleanField, SubmitField, ValidationError, TextAreaField
+from wtforms import (StringField, PasswordField, BooleanField, SubmitField,
+                     ValidationError)
 from wtforms.validators import DataRequired, Length, Email, Regexp, EqualTo
 from ..models import User
 
@@ -13,13 +14,20 @@ class LoginForm(FlaskForm):
 
 class RegistrationForm(FlaskForm):
     email = StringField('Email', validators=[DataRequired(), Email()])
-    username = StringField('Username', validators=[
-        DataRequired(), Length(1, 64),
-        Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0,
-               'Usernames must have only letters, numbers, dots or '
-               'underscores')])
-    password = PasswordField('Password', validators=[
-        DataRequired(), EqualTo('password2', message='Passwords must match.')])
+    username = StringField(
+        'Username',
+        validators=[DataRequired(),
+                    Length(1, 64),
+                    Regexp('^[A-Za-z][A-Za-z0-9_.]*$',
+                           0,
+                           'Usernames must have only letters, numbers, dots '
+                           'or underscores')]
+    )
+    password = PasswordField(
+        'Password',
+        validators=[DataRequired(),
+                    EqualTo('password2', message='Passwords must match.')]
+    )
     password2 = PasswordField('Confirm password', validators=[DataRequired()])
     submit = SubmitField('Register')
 
@@ -79,8 +87,8 @@ class ChangePasswordForm(FlaskForm):
 
 
 class EditProfileForm(FlaskForm):
-    email = StringField('Change Email', validators=[Length(0, 64),
-                                                    DataRequired()])
+    email = StringField('Change Email',
+                        validators=[Length(0, 254), DataRequired()])
     submit = SubmitField('Change Email')
 
     def __init__(self, user, *args, **kwargs):

app/models.py

@@ -107,7 +107,7 @@ class User(UserMixin, db.Model):
     # Primary key
     id = db.Column(db.Integer, primary_key=True)
     confirmed = db.Column(db.Boolean, default=False)
-    email = db.Column(db.String(64), unique=True, index=True)
+    email = db.Column(db.String(254), unique=True, index=True)
     password_hash = db.Column(db.String(128))
     registration_date = db.Column(db.DateTime(), default=datetime.utcnow)
     role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))

migrations/versions/3ca96d906e29_.py

 """empty message
 
 Revision ID: 3ca96d906e29
-Revises: 
+Revises:
 Create Date: 2019-09-05 11:43:41.634109
 
 """
@@ -30,7 +30,7 @@ def upgrade():
     op.create_table('users',
     sa.Column('id', sa.Integer(), nullable=False),
     sa.Column('confirmed', sa.Boolean(), nullable=True),
-    sa.Column('email', sa.String(length=64), nullable=True),
+    sa.Column('email', sa.String(length=254), nullable=True),
     sa.Column('password_hash', sa.String(length=128), nullable=True),
     sa.Column('registration_date', sa.DateTime(), nullable=True),
     sa.Column('role_id', sa.Integer(), nullable=True),