diff --git a/core/admin/Dockerfile b/core/admin/Dockerfile
index 2d209b32..a5e806d1 100644
--- a/core/admin/Dockerfile
+++ b/core/admin/Dockerfile
@@ -8,8 +8,9 @@ RUN mkdir -p /app
 WORKDIR /app
 
 COPY requirements-prod.txt requirements.txt
-RUN apk add --no-cache openssl curl \
- && apk add --no-cache --virtual build-dep openssl-dev libffi-dev python3-dev build-base \
+RUN apk add --no-cache libressl curl postgresql-client \
+ && apk add --no-cache --virtual build-dep \
+ libressl-dev libffi-dev python3-dev build-base postgresql-dev \
  && pip3 install -r requirements.txt \
  && apk del --no-cache build-dep
 
diff --git a/core/admin/mailu/configuration.py b/core/admin/mailu/configuration.py
index 05df8b1f..04d545c8 100644
--- a/core/admin/mailu/configuration.py
+++ b/core/admin/mailu/configuration.py
@@ -73,14 +73,20 @@ class ConfigManager(dict):
             key: os.environ.get(key, value)
             for key, value in DEFAULT_CONFIG.items()
         })
-        if self.config['SQL_FLAVOR'] != 'sqlite'
+        if self.config['DB_FLAVOR'] != 'sqlite':
             self.setsql()
         app.config = self
 
-    def setsql(self)
-        if not self.config['DB_PW']
+    def setsql(self):
+        if not self.config['DB_PW']:
             self.config['DB_PW'] = self.config['SECRET_KEY']
-        self.config['SQLALCHEMY_DATABASE_URI'] = '{driver}://{user}:{pw}@{url}/{db}'.format(driver=DB_FLAVOR,user=DB_USER,pw=DB_PW,url=DB_URL,db=DB_NAME)
+        self.config['SQLALCHEMY_DATABASE_URI'] = '{driver}://{user}:{pw}@{url}/{db}'.format(
+            driver=self.config['DB_FLAVOR'],
+            user=self.config['DB_USER'],
+            pw=self.config['DB_PW'],
+            url=self.config['DB_URL'],
+            db=self.config['DB_NAME']
+        )
 
     def setdefault(self, key, value):
         if key not in self.config:
diff --git a/core/admin/mailu/models.py b/core/admin/mailu/models.py
index c25d30cb..15f95e97 100644
--- a/core/admin/mailu/models.py
+++ b/core/admin/mailu/models.py
@@ -287,7 +287,7 @@ class User(Base, Email):
     # Settings
     displayed_name = db.Column(db.String(160), nullable=False, default="")
     spam_enabled = db.Column(db.Boolean(), nullable=False, default=True)
-    spam_threshold = db.Column(db.Integer(), nullable=False, default=80.0)
+    spam_threshold = db.Column(db.Integer(), nullable=False, default=80)
 
     # Flask-login attributes
     is_authenticated = True
@@ -441,7 +441,7 @@ class Fetch(Base):
         nullable=False)
     user = db.relationship(User,
         backref=db.backref('fetches', cascade='all, delete-orphan'))
-    protocol = db.Column(db.Enum('imap', 'pop3'), nullable=False)
+    protocol = db.Column(db.Enum('imap', 'pop3', name='protocol'), nullable=False)
     host = db.Column(db.String(255), nullable=False)
     port = db.Column(db.Integer(), nullable=False)
     tls = db.Column(db.Boolean(), nullable=False)
diff --git a/core/admin/migrations/versions/049fed905da7_.py b/core/admin/migrations/versions/049fed905da7_.py
index ce410844..feca8dbb 100644
--- a/core/admin/migrations/versions/049fed905da7_.py
+++ b/core/admin/migrations/versions/049fed905da7_.py
@@ -12,11 +12,13 @@ down_revision = '49d77a93118e'
 
 from alembic import op
 import sqlalchemy as sa
+from flask import current_app as app
 
 
 def upgrade():
-    with op.batch_alter_table('user') as batch:
-        batch.alter_column('email', type_=sa.String(length=255, collation="NOCASE"))
+    if app.config['DB_FLAVOR'] == 'sqlite':
+        with op.batch_alter_table('user') as batch:
+            batch.alter_column('email', type_=sa.String(length=255, collation="NOCASE"))
 
 
 def downgrade():
diff --git a/core/admin/migrations/versions/27ae2f102682_.py b/core/admin/migrations/versions/27ae2f102682_.py
index f821aff2..1f26072a 100644
--- a/core/admin/migrations/versions/27ae2f102682_.py
+++ b/core/admin/migrations/versions/27ae2f102682_.py
@@ -35,7 +35,7 @@ def upgrade():
          )
     # set default to 80%
     with op.batch_alter_table('user') as batch:
-        batch.alter_column('spam_threshold', default=80.)
+        batch.alter_column('spam_threshold', server_default='80')
 
 def downgrade():
     connection = op.get_bind()
@@ -50,4 +50,4 @@ def downgrade():
          )
     # set default to 10/15
     with op.batch_alter_table('user') as batch:
-        batch.alter_column('spam_threshold', default=10.)
+        batch.alter_column('spam_threshold', server_default='10')
diff --git a/core/admin/migrations/versions/9c28df23f77e_.py b/core/admin/migrations/versions/9c28df23f77e_.py
index edf8d8ef..1d2d656f 100644
--- a/core/admin/migrations/versions/9c28df23f77e_.py
+++ b/core/admin/migrations/versions/9c28df23f77e_.py
@@ -12,13 +12,15 @@ down_revision = 'c162ac88012a'
 
 from alembic import op
 import sqlalchemy as sa
+from flask import current_app as app
 
 
 def upgrade():
-    with op.batch_alter_table('user') as batch:
-        batch.alter_column('email', type_=sa.String(length=255, collation="NOCASE"))
-    with op.batch_alter_table('alias') as batch:
-        batch.alter_column('email', type_=sa.String(length=255, collation="NOCASE"))
+    if app.config['DB_FLAVOR'] == 'sqlite':
+        with op.batch_alter_table('user') as batch:
+            batch.alter_column('email', type_=sa.String(length=255, collation="NOCASE"))
+        with op.batch_alter_table('alias') as batch:
+            batch.alter_column('email', type_=sa.String(length=255, collation="NOCASE"))
 
 
 def downgrade():
diff --git a/core/admin/requirements-prod.txt b/core/admin/requirements-prod.txt
index 2ca59edc..1281146a 100644
--- a/core/admin/requirements-prod.txt
+++ b/core/admin/requirements-prod.txt
@@ -44,3 +44,4 @@ visitor==0.1.3
 Werkzeug==0.14.1
 WTForms==2.2.1
 WTForms-Components==0.10.3
+psycopg2