diff --git a/app/auth/views/fido.py b/app/auth/views/fido.py
index d2b374d1..b480dd0d 100644
--- a/app/auth/views/fido.py
+++ b/app/auth/views/fido.py
@@ -1,5 +1,6 @@
 import json
 import secrets
+
 import webauthn
 from flask import (
     request,
diff --git a/app/config.py b/app/config.py
index f25b4f8f..ca5e4687 100644
--- a/app/config.py
+++ b/app/config.py
@@ -1,9 +1,9 @@
 import os
 import random
+import socket
 import string
 import subprocess
 from urllib.parse import urlparse
-import socket
 
 from dotenv import load_dotenv
 
diff --git a/app/dashboard/views/batch_import.py b/app/dashboard/views/batch_import.py
index 00e4a363..1e190dfe 100644
--- a/app/dashboard/views/batch_import.py
+++ b/app/dashboard/views/batch_import.py
@@ -1,15 +1,13 @@
 import arrow
 from flask import render_template, flash, request, redirect, url_for
 from flask_login import login_required, current_user
-from flask_wtf import FlaskForm
-from wtforms import StringField, validators
 
 from app import s3
 from app.config import JOB_BATCH_IMPORT
 from app.dashboard.base import dashboard_bp
 from app.extensions import db
 from app.log import LOG
-from app.models import CustomDomain, File, BatchImport, Job
+from app.models import File, BatchImport, Job
 from app.utils import random_string
 
 
diff --git a/app/dashboard/views/custom_alias.py b/app/dashboard/views/custom_alias.py
index 670676d1..58c4dd7d 100644
--- a/app/dashboard/views/custom_alias.py
+++ b/app/dashboard/views/custom_alias.py
@@ -4,9 +4,7 @@ from itsdangerous import TimestampSigner, SignatureExpired
 
 from app.config import (
     DISABLE_ALIAS_SUFFIX,
-    ALIAS_DOMAINS,
     CUSTOM_ALIAS_SECRET,
-    PREMIUM_ALIAS_DOMAINS,
 )
 from app.dashboard.base import dashboard_bp
 from app.extensions import db
diff --git a/app/dashboard/views/custom_domain.py b/app/dashboard/views/custom_domain.py
index 32d0c044..129961ce 100644
--- a/app/dashboard/views/custom_domain.py
+++ b/app/dashboard/views/custom_domain.py
@@ -3,7 +3,7 @@ from flask_login import login_required, current_user
 from flask_wtf import FlaskForm
 from wtforms import StringField, validators
 
-from app.config import EMAIL_SERVERS_WITH_PRIORITY, ALIAS_DOMAINS
+from app.config import EMAIL_SERVERS_WITH_PRIORITY
 from app.dashboard.base import dashboard_bp
 from app.email_utils import get_email_domain_part
 from app.extensions import db
diff --git a/app/dashboard/views/enter_sudo.py b/app/dashboard/views/enter_sudo.py
index c2c4819e..e5f5a33c 100644
--- a/app/dashboard/views/enter_sudo.py
+++ b/app/dashboard/views/enter_sudo.py
@@ -1,10 +1,10 @@
+from functools import wraps
 from time import time
 
 from flask import render_template, flash, redirect, url_for, session, request
 from flask_login import login_required, current_user
 from flask_wtf import FlaskForm
 from wtforms import PasswordField, validators
-from functools import wraps
 
 from app.dashboard.base import dashboard_bp
 from app.log import LOG
diff --git a/app/dashboard/views/fido_manage.py b/app/dashboard/views/fido_manage.py
index db684868..6a089666 100644
--- a/app/dashboard/views/fido_manage.py
+++ b/app/dashboard/views/fido_manage.py
@@ -4,10 +4,10 @@ from flask_wtf import FlaskForm
 from wtforms import HiddenField, validators
 
 from app.dashboard.base import dashboard_bp
+from app.dashboard.views.enter_sudo import sudo_required
 from app.extensions import db
 from app.log import LOG
 from app.models import RecoveryCode, Fido
-from app.dashboard.views.enter_sudo import sudo_required
 
 
 class FidoManageForm(FlaskForm):
diff --git a/app/dashboard/views/fido_setup.py b/app/dashboard/views/fido_setup.py
index ddc7717c..6ca731ce 100644
--- a/app/dashboard/views/fido_setup.py
+++ b/app/dashboard/views/fido_setup.py
@@ -1,7 +1,6 @@
 import json
 import secrets
 import uuid
-from time import time
 
 import webauthn
 from flask import render_template, flash, redirect, url_for, session
@@ -11,10 +10,10 @@ from wtforms import StringField, HiddenField, validators
 
 from app.config import RP_ID, URL
 from app.dashboard.base import dashboard_bp
+from app.dashboard.views.enter_sudo import sudo_required
 from app.extensions import db
 from app.log import LOG
 from app.models import Fido, RecoveryCode
-from app.dashboard.views.enter_sudo import sudo_required
 
 
 class FidoTokenForm(FlaskForm):
diff --git a/app/dashboard/views/mailbox_detail.py b/app/dashboard/views/mailbox_detail.py
index 1f422397..2df0e4fb 100644
--- a/app/dashboard/views/mailbox_detail.py
+++ b/app/dashboard/views/mailbox_detail.py
@@ -14,7 +14,7 @@ from app.email_utils import email_can_be_used_as_mailbox
 from app.email_utils import mailbox_already_used, render, send_email
 from app.extensions import db
 from app.log import LOG
-from app.models import Alias, DeletedAlias, AuthorizedAddress
+from app.models import Alias, AuthorizedAddress
 from app.models import Mailbox
 from app.pgp_utils import PGPException, load_public_key
 
diff --git a/app/dashboard/views/mfa_setup.py b/app/dashboard/views/mfa_setup.py
index afb639e4..0ec18e1c 100644
--- a/app/dashboard/views/mfa_setup.py
+++ b/app/dashboard/views/mfa_setup.py
@@ -5,9 +5,9 @@ from flask_wtf import FlaskForm
 from wtforms import StringField, validators
 
 from app.dashboard.base import dashboard_bp
+from app.dashboard.views.enter_sudo import sudo_required
 from app.extensions import db
 from app.log import LOG
-from app.dashboard.views.enter_sudo import sudo_required
 
 
 class OtpTokenForm(FlaskForm):
diff --git a/app/dashboard/views/setting.py b/app/dashboard/views/setting.py
index 62868afa..269127fe 100644
--- a/app/dashboard/views/setting.py
+++ b/app/dashboard/views/setting.py
@@ -34,7 +34,6 @@ from app.models import (
     EmailChange,
     User,
     Alias,
-    DeletedAlias,
     CustomDomain,
     Client,
     AliasGeneratorEnum,
diff --git a/app/email_utils.py b/app/email_utils.py
index 5b1b97a5..ed5e6956 100644
--- a/app/email_utils.py
+++ b/app/email_utils.py
@@ -1,14 +1,12 @@
 import email
 import os
+import re
 from email.header import decode_header
 from email.message import Message
-from email.mime.base import MIMEBase
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
 from email.utils import make_msgid, formatdate, parseaddr
 from smtplib import SMTP
-from typing import Optional
-import re
 
 import arrow
 import dkim
@@ -32,7 +30,6 @@ from app.config import (
     SENDER,
     URL,
     LANDING_PAGE_URL,
-    PREMIUM_ALIAS_DOMAINS,
 )
 from app.dns_utils import get_mx_domains
 from app.extensions import db
diff --git a/app/models.py b/app/models.py
index 322d7984..5e303591 100644
--- a/app/models.py
+++ b/app/models.py
@@ -9,7 +9,7 @@ import bcrypt
 from arrow import Arrow
 from flask import url_for
 from flask_login import UserMixin
-from sqlalchemy import text, desc, CheckConstraint, and_, func, case
+from sqlalchemy import text, desc, CheckConstraint
 from sqlalchemy_utils import ArrowType
 
 from app import s3
@@ -24,9 +24,6 @@ from app.config import (
     LANDING_PAGE_URL,
     FIRST_ALIAS_DOMAIN,
     DISABLE_ONBOARDING,
-    PAGE_LIMIT,
-    ALIAS_DOMAINS,
-    PREMIUM_ALIAS_DOMAINS,
 )
 from app.errors import AliasInTrashError
 from app.extensions import db
diff --git a/app/pgp_utils.py b/app/pgp_utils.py
index c1ac6f7b..a0ccb054 100644
--- a/app/pgp_utils.py
+++ b/app/pgp_utils.py
@@ -7,7 +7,6 @@ from memory_profiler import memory_usage
 from app.config import GNUPGHOME
 from app.log import LOG
 from app.models import Mailbox, Contact
-from app.utils import random_string
 
 gpg = gnupg.GPG(gnupghome=GNUPGHOME)
 gpg.encoding = "utf-8"
diff --git a/app/spamassassin_utils.py b/app/spamassassin_utils.py
index 0a05f745..e725a6ae 100644
--- a/app/spamassassin_utils.py
+++ b/app/spamassassin_utils.py
@@ -1,7 +1,10 @@
 """Inspired from
 https://github.com/petermat/spamassassin_client
 """
-import socket, select, re, logging
+import logging
+import re
+import select
+import socket
 from io import BytesIO
 
 from app.log import LOG