diff --git a/scanners/dns-processor/Dockerfile b/scanners/dns-processor/Dockerfile
index e7fd610215..f30e593f3e 100644
--- a/scanners/dns-processor/Dockerfile
+++ b/scanners/dns-processor/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:21.04
+FROM ubuntu:20.04
 
 # Copy local code to the container image.
 ENV PYTHONUNBUFFERED 1
diff --git a/scanners/dns-processor/dns_processor/__init__.py b/scanners/dns-processor/dns_processor/__init__.py
index 108e73e4ec..4e6bde3fac 100644
--- a/scanners/dns-processor/dns_processor/__init__.py
+++ b/scanners/dns-processor/dns_processor/__init__.py
@@ -503,90 +503,6 @@ def process_results(results, domain_key, user_key, shared_id):
             # store key_modulus as string, ArangoDB is not capable or storing numbers this size
             results["dkim"][selector]["public_key_modulus"] = str(results["dkim"][selector]["public_key_modulus"])
             keyModulus = results["dkim"][selector]["public_key_modulus"]
-            # going to the database to find previous results by keyModulus
-            # From the test data:
-            # "selector1": {
-            #     "t_value": "null",
-            #     "txt_record": {
-            #         "v": "DKIM1",
-            #         "k": "rsa",
-            #         "p": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3rvAQg9bl72tae1RFu4zdx1ZE4E8VUbQfxDcm/x6YW2eNRdGg9cRSgqSLXmj4I+HQQ4GHFItn7Hb0ubGt6AJYMCvygbnnwFX2Skt+w/msnXzQOYY+NR6DEfL/4kwiDaawcDumvD2JfEXD3yCyPBoZStg1wf0a9KgLQQNe4aMREQIDAQAB",
-            #     },
-            #     "public_key_value": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3rvAQg9bl72tae1RFu4zdx1ZE4E8VUbQfxDcm/x6YW2eNRdGg9cRSgqSLXmj4I+HQQ4GHFItn7Hb0ubGt6AJYMCvygbnnwFX2Skt+w/msnXzQOYY+NR6DEfL/4kwiDaawcDumvD2JfEXD3yCyPBoZStg1wf0a9KgLQQNe4aMREQIDAQAB",
-            #     "key_size": 1024,
-            #     "key_type": "rsa",
-            #     "public_key_modulus": 128986835293314190150497987524189448449432921513193192948873532904302192799974922792602624695895630642090219163581382671361079596067726465810188870659566753252627341029040386217423692275583904625222303885358524296924420382485253455698862760166022132727095317896399159035250651155696560064015533460599431434513,
-            #     "public_exponent": 65537,
-            # }
-            previous_dkim_results = db.collection("dkimResults").find(
-                {"keyModulus": keyModulus}
-            )
-
-            # Has this public key been used before?
-            # "dkim14": {
-            #     "en": {
-            #         "tagName": "P-duplicate",
-            #         "guidance": "Public key used for multiple domains",
-            # graph traversal across edges in dkimToDkimResults
-            for previous_dkim_result in previous_dkim_results:
-                edges = db.collection("dkimToDkimResults").find(
-                    {"_to": previous_dkim_result["_id"]}
-                )
-                for edge in edges:
-                    previous_dkim = db.collection("dkim").get({"_id": edge["_from"]})
-
-                    # Check if PK was used for another domain
-                    previous_dkim_domain_query = db.collection("domainsDKIM").find(
-                        {"_to": previous_dkim["_id"]}, limit=1
-                    )
-                    previous_dkim_domain = previous_dkim_domain_query.next()
-                    if (previous_dkim_domain["_key"] != domain_key) and (
-                        "dkim14" not in guidance_tags["dkim"][selector]["negativeTags"]
-                    ):
-                        guidance_tags["dkim"][selector]["negativeTags"].append("dkim14")
-
-                    # Check if public key is older than 1 year
-                    current_timestamp = datetime.datetime.strptime(
-                        timestamp, "%Y-%m-%d %H:%M:%S.%f"
-                    )
-                    previous_timestamp = datetime.datetime.strptime(
-                        previous_dkim["timestamp"], "%Y-%m-%d %H:%M:%S.%f"
-                    )
-                    for edge in edges:
-                        previous_dkim = db.collection("dkim").get(
-                            {"_id": edge["_from"]}
-                        )
-
-                        # Check if PK was used for another domain
-                        previous_dkim_domain_query = db.collection("domainsDKIM").find(
-                            {"_to": previous_dkim["_id"]}, limit=1
-                        )
-                        previous_dkim_domain = previous_dkim_domain_query.next()
-                        if (previous_dkim_domain["_key"] != domain_key) and (
-                            "dkim14"
-                            not in guidance_tags["dkim"][selector]["negativeTags"]
-                        ):
-                            guidance_tags["dkim"][selector]["negativeTags"].append(
-                                "dkim14"
-                            )
-
-                        # Check if PK is older than 1 year
-                        current_timestamp = datetime.datetime.strptime(
-                            timestamp, "%Y-%m-%d %H:%M:%S.%f"
-                        )
-                        previous_timestamp = datetime.datetime.strptime(
-                            previous_dkim["timestamp"], "%Y-%m-%d %H:%M:%S.%f"
-                        )
-
-                        time_delta = current_timestamp - previous_timestamp
-
-                        if (time_delta.total_seconds() > 31536000) and (
-                            "dkim10"
-                            not in guidance_tags["dkim"][selector]["negativeTags"]
-                        ):
-                            guidance_tags["dkim"][selector]["negativeTags"].append(
-                                "dkim10"
-                            )
 
             dkimResults.update(
                 {