diff --git a/app/config.py b/app/config.py
index 2abd8e22..a071b73c 100644
--- a/app/config.py
+++ b/app/config.py
@@ -385,6 +385,8 @@ ALIAS_LIMIT = os.environ.get("ALIAS_LIMIT") or "100/day;50/hour;5/minute"
 
 ENABLE_SPAM_ASSASSIN = "ENABLE_SPAM_ASSASSIN" in os.environ
 
+ALIAS_RANDOM_SUFFIX_LENGTH = int(os.environ.get("ALIAS_RAND_SUFFIX_LENGTH", 5))
+
 try:
     HIBP_SCAN_INTERVAL_DAYS = int(os.environ.get("HIBP_SCAN_INTERVAL_DAYS"))
 except Exception:
diff --git a/app/dashboard/templates/dashboard/setting.html b/app/dashboard/templates/dashboard/setting.html
index 16322884..410bf7ef 100644
--- a/app/dashboard/templates/dashboard/setting.html
+++ b/app/dashboard/templates/dashboard/setting.html
@@ -247,6 +247,22 @@
           </select>
           <button class="btn btn-outline-primary">Update</button>
         </form>
+
+        <div id="random-alias-suffix" class="mt-3 mb-1">Select the default suffix generator for aliases.</div>
+        <form method="post" action="#random-alias-suffix" class="form-inline">
+          <input type="hidden" name="form-name" value="random-alias-suffix">
+          <select class="form-control mr-sm-2" name="random-alias-suffix-generator">
+  
+            <option value="0" {% if current_user.random_alias_suffix==0 %} selected {% endif %}>
+              Random word from our dictionary
+            </option>
+            <option value="1" {% if current_user.random_alias_suffix==1 %} selected {% endif %}>
+              Random combination of {{ ALIAS_RAND_SUFFIX_LENGTH }} letter and digits
+            </option>
+          </select>
+          <button class="btn btn-outline-primary">Update</button>
+        </form>
+
       </div>
     </div>
     <!-- END Random alias -->
diff --git a/app/dashboard/views/custom_alias.py b/app/dashboard/views/custom_alias.py
index b17ac447..e6da8f4b 100644
--- a/app/dashboard/views/custom_alias.py
+++ b/app/dashboard/views/custom_alias.py
@@ -23,7 +23,7 @@ from app.models import (
     AliasMailbox,
     DomainDeletedAlias,
 )
-from app.utils import random_word, word_exist
+from app.utils import get_suffix
 
 signer = TimestampSigner(CUSTOM_ALIAS_SECRET)
 
@@ -54,7 +54,7 @@ def get_available_suffixes(user: User) -> [SuffixInfo]:
     # for each user domain, generate both the domain and a random suffix version
     for custom_domain in user_custom_domains:
         if custom_domain.random_prefix_generation:
-            suffix = "." + random_word() + "@" + custom_domain.domain
+            suffix = "." + get_suffix(user) + "@" + custom_domain.domain
             suffix_info = SuffixInfo(True, suffix, signer.sign(suffix).decode(), False)
             if user.default_alias_custom_domain_id == custom_domain.id:
                 suffixes.insert(0, suffix_info)
@@ -77,7 +77,7 @@ def get_available_suffixes(user: User) -> [SuffixInfo]:
     # then SimpleLogin domain
     for sl_domain in user.get_sl_domains():
         suffix = (
-            ("" if DISABLE_ALIAS_SUFFIX else "." + random_word())
+            ("" if DISABLE_ALIAS_SUFFIX else "." + get_suffix(user))
             + "@"
             + sl_domain.domain
         )
@@ -281,14 +281,6 @@ def verify_prefix_suffix(user: User, alias_prefix, alias_suffix) -> bool:
             LOG.exception("User %s submits a wrong alias suffix %s", user, alias_suffix)
             return False
 
-        random_word_part = alias_domain_prefix[1:]
-        if not word_exist(random_word_part):
-            LOG.exception(
-                "alias suffix %s needs to start with a random word, user %s",
-                alias_suffix,
-                user,
-            )
-            return False
     else:
         if alias_domain not in user_custom_domains:
             if not DISABLE_ALIAS_SUFFIX:
diff --git a/app/dashboard/views/setting.py b/app/dashboard/views/setting.py
index b4b837d8..c8db8202 100644
--- a/app/dashboard/views/setting.py
+++ b/app/dashboard/views/setting.py
@@ -15,7 +15,12 @@ from wtforms import StringField, validators
 from wtforms.fields.html5 import EmailField
 
 from app import s3, email_utils
-from app.config import URL, FIRST_ALIAS_DOMAIN, JOB_DELETE_ACCOUNT
+from app.config import (
+    URL,
+    FIRST_ALIAS_DOMAIN,
+    JOB_DELETE_ACCOUNT,
+    ALIAS_RANDOM_SUFFIX_LENGTH,
+)
 from app.dashboard.base import dashboard_bp
 from app.email_utils import (
     email_can_be_used_as_mailbox,
@@ -32,6 +37,7 @@ from app.models import (
     Alias,
     CustomDomain,
     AliasGeneratorEnum,
+    AliasSuffixEnum,
     ManualSubscription,
     SenderFormatEnum,
     SLDomain,
@@ -240,6 +246,14 @@ def setting():
             flash("Your preference has been updated", "success")
             return redirect(url_for("dashboard.setting"))
 
+        elif request.form.get("form-name") == "random-alias-suffix":
+            scheme = int(request.form.get("random-alias-suffix-generator"))
+            if AliasSuffixEnum.has_value(scheme):
+                current_user.random_alias_suffix = scheme
+                db.session.commit()
+            flash("Your preference has been updated", "success")
+            return redirect(url_for("dashboard.setting"))
+
         elif request.form.get("form-name") == "change-sender-format":
             sender_format = int(request.form.get("sender-format"))
             if SenderFormatEnum.has_value(sender_format):
@@ -292,6 +306,7 @@ def setting():
         apple_sub=apple_sub,
         coinbase_sub=coinbase_sub,
         FIRST_ALIAS_DOMAIN=FIRST_ALIAS_DOMAIN,
+        ALIAS_RAND_SUFFIX_LENGTH=ALIAS_RANDOM_SUFFIX_LENGTH,
     )
 
 
diff --git a/app/models.py b/app/models.py
index 2c34cd4f..3ca044cf 100644
--- a/app/models.py
+++ b/app/models.py
@@ -34,8 +34,8 @@ from app.utils import (
     convert_to_id,
     random_string,
     random_words,
-    random_word,
     sanitize_email,
+    get_suffix,
 )
 
 
@@ -162,6 +162,11 @@ class AliasGeneratorEnum(EnumE):
     uuid = 2  # aliases are generated based on uuid
 
 
+class AliasSuffixEnum(EnumE):
+    word = 0  # Random word from dictionary file
+    random_string = 1  # Completely random string
+
+
 class Hibp(db.Model, ModelMixin):
     __tablename__ = "hibp"
     name = db.Column(db.String(), nullable=False, unique=True, index=True)
@@ -293,6 +298,16 @@ class User(db.Model, ModelMixin, UserMixin, PasswordOracle):
         db.Boolean, default=False, nullable=False, server_default="0"
     )
 
+    # whether to use random string or random word as suffix
+    # Random word from dictionary file -> 0
+    # Completely random string -> 1
+    random_alias_suffix = db.Column(
+        db.Integer,
+        nullable=False,
+        default=AliasSuffixEnum.random_string.value,
+        server_default=str(AliasSuffixEnum.random_string.value),
+    )
+
     @classmethod
     def create(cls, email, name="", password=None, **kwargs):
         user: User = super(User, cls).create(email=email, name=name, **kwargs)
@@ -1132,7 +1147,7 @@ class Alias(db.Model, ModelMixin):
 
         # find the right suffix - avoid infinite loop by running this at max 1000 times
         for i in range(1000):
-            suffix = random_word()
+            suffix = get_suffix(user)
             email = f"{prefix}.{suffix}@{FIRST_ALIAS_DOMAIN}"
 
             if not cls.get_by(email=email) and not DeletedAlias.get_by(email=email):
diff --git a/app/utils.py b/app/utils.py
index 8b716fc5..743c0dea 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -4,8 +4,9 @@ import urllib.parse
 
 from unidecode import unidecode
 
-from .config import WORDS_FILE_PATH
+from .config import WORDS_FILE_PATH, ALIAS_RANDOM_SUFFIX_LENGTH
 from .log import LOG
+from .models import User, AliasSuffixEnum
 
 with open(WORDS_FILE_PATH) as f:
     LOG.d("load words file: %s", WORDS_FILE_PATH)
@@ -16,6 +17,20 @@ def random_word():
     return random.choice(_words)
 
 
+def get_suffix(user: User) -> str:
+    """Get random suffix for an alias based on user's preference.
+
+    Args:
+        user (User): the user who is trying to create an alias
+
+    Returns:
+        str: the random suffix generated
+    """
+    if user.random_alias_suffix == AliasSuffixEnum.random_string.value:
+        return random_string(ALIAS_RANDOM_SUFFIX_LENGTH, include_digits=True)
+    return random_word()
+
+
 def word_exist(word):
     return word in _words
 
@@ -27,9 +42,12 @@ def random_words():
     return "_".join([random.choice(_words) for i in range(nb_words)])
 
 
-def random_string(length=10):
+def random_string(length=10, include_digits=False):
     """Generate a random string of fixed length """
     letters = string.ascii_lowercase
+    if include_digits:
+        letters += string.digits
+
     return "".join(random.choice(letters) for _ in range(length))