diff --git a/src/uagents/agent.py b/src/uagents/agent.py
index 56efae17..6ab7dab6 100644
--- a/src/uagents/agent.py
+++ b/src/uagents/agent.py
@@ -33,7 +33,6 @@
 )
 from uagents.mailbox import MailboxClient
 from uagents.config import (
-    ConfigurationError,
     CONTRACT_ALMANAC,
     REGISTRATION_FEE,
     REGISTRATION_DENOM,
@@ -87,13 +86,17 @@ def __init__(
         self._endpoints = parse_endpoint_config(endpoint)
         self._use_mailbox = False
 
-        # agentverse config overrides mailbox config
-        # but mailbox is kept for backwards compatibility
-        if agentverse and mailbox:
-            raise ConfigurationError(
-                "Cannot specify both agentverse and mailbox configuration"
+        if mailbox:
+            # agentverse config overrides mailbox config
+            # but mailbox is kept for backwards compatibility
+            if agentverse:
+                self._logger.warning(
+                    "Ignoring the provided 'mailbox' configuration since 'agentverse' overrides it"
+                )
+            self._logger.warning(
+                "Then 'mailbox' configuration is deprecated in favor of 'agentverse'"
             )
-        agentverse = mailbox if agentverse is None else agentverse
+            agentverse = mailbox
         self._agentverse = parse_agentverse_config(agentverse)
         self._use_mailbox = self._agentverse["use_mailbox"]
         if self._use_mailbox:
@@ -373,7 +376,8 @@ def include(self, protocol: Protocol, publish_manifest: Optional[bool] = False):
     def publish_manifest(self, manifest: Dict[str, Any]):
         try:
             resp = requests.post(
-                f"{self._agentverse['http_prefix']}://{self._agentverse['base_url']}/v1/almanac/manifests",
+                f"{self._agentverse['http_prefix']}://{self._agentverse['base_url']}"
+                + "/v1/almanac/manifests",
                 json=manifest,
                 timeout=5,
             )
diff --git a/src/uagents/config.py b/src/uagents/config.py
index a2f797ef..b56e3414 100644
--- a/src/uagents/config.py
+++ b/src/uagents/config.py
@@ -32,10 +32,6 @@ class AgentNetwork(Enum):
 DEFAULT_ENVELOPE_TIMEOUT_SECONDS = 30
 
 
-class ConfigurationError(Exception):
-    pass
-
-
 def parse_endpoint_config(
     endpoint: Optional[Union[str, List[str], Dict[str, dict]]]
 ) -> List[Dict[str, Any]]: