diff --git a/backend/backend_config.toml b/backend/backend_config.toml
index d0f976ee6..c5b28bb26 100644
--- a/backend/backend_config.toml
+++ b/backend/backend_config.toml
@@ -151,4 +151,4 @@ concurrency = 5
 # initiated the verification request in a multi-tenant system.
 # 
 # Env variable: RCH__STORAGE__0__POSTGRES__TABLE_NAME
-# extra = {"my_custom_key": "my_custom_value"}
+# extra = { "my_custom_key" = "my_custom_value" }
diff --git a/backend/src/config.rs b/backend/src/config.rs
index bd8066ca4..1ad69b4db 100644
--- a/backend/src/config.rs
+++ b/backend/src/config.rs
@@ -27,8 +27,8 @@ use config::Config;
 use lapin::Channel;
 use serde::{Deserialize, Serialize};
 use sqlx::PgPool;
+use std::collections::HashMap;
 use std::sync::Arc;
-use std::{any::Any, collections::HashMap};
 use tracing::warn;
 
 #[derive(Debug, Default, Serialize, Deserialize)]
@@ -150,11 +150,16 @@ impl BackendConfig {
 	///
 	/// This is quite hacky, and it will most probably be refactored away in
 	/// future versions. We however need to rethink how to do the `/v1/bulk`
-	/// endpoints first.
+	/// endpoints first. Simply using downcasting should be a warning sign that
+	/// we're doing something wrong.
+	///
+	/// ref: https://github.com/reacherhq/check-if-email-exists/issues/1544
 	pub fn get_pg_pool(&self) -> Option<PgPool> {
-		self.storages
-			.iter()
-			.find_map(|s| <dyn Any>::downcast_ref::<PostgresStorage>(s).map(|s| s.pg_pool.clone()))
+		self.storages.iter().find_map(|s| {
+			s.as_any()
+				.downcast_ref::<PostgresStorage>()
+				.map(|s| s.pg_pool.clone())
+		})
 	}
 }
 
diff --git a/backend/src/http/error.rs b/backend/src/http/error.rs
index 0428994f5..af4c095f2 100644
--- a/backend/src/http/error.rs
+++ b/backend/src/http/error.rs
@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+use crate::storage::error::StorageError;
 use check_if_email_exists::{CheckEmailInputBuilderError, LOG_TARGET};
 use serde::ser::SerializeStruct;
 use serde::Serialize;
@@ -24,7 +25,6 @@ use warp::{http::StatusCode, reject};
 
 /// Trait combining Display and Debug.
 pub trait DisplayDebug: fmt::Display + Debug + Sync + Send {}
-
 impl<T: fmt::Display + Debug + Sync + Send> DisplayDebug for T {}
 
 /// Struct describing an error response.
@@ -113,6 +113,12 @@ impl From<anyhow::Error> for ReacherResponseError {
 	}
 }
 
+impl From<StorageError> for ReacherResponseError {
+	fn from(e: StorageError) -> Self {
+		ReacherResponseError::new(StatusCode::INTERNAL_SERVER_ERROR, e)
+	}
+}
+
 /// This function receives a `Rejection` and tries to return a custom value,
 /// otherwise simply passes the rejection along.
 pub async fn handle_rejection(err: warp::Rejection) -> Result<impl warp::Reply, warp::Rejection> {
diff --git a/backend/src/http/mod.rs b/backend/src/http/mod.rs
index e94f62f2a..be5fe373b 100644
--- a/backend/src/http/mod.rs
+++ b/backend/src/http/mod.rs
@@ -112,7 +112,7 @@ pub fn with_db(
 			pool.ok_or_else(|| {
 				warp::reject::custom(ReacherResponseError::new(
 					StatusCode::SERVICE_UNAVAILABLE,
-					"Please configure a database on Reacher before calling this endpoint",
+					"Please configure a Postgres database on Reacher before calling this endpoint",
 				))
 			})
 		}
diff --git a/backend/src/http/v1/check_email/post.rs b/backend/src/http/v1/check_email/post.rs
index 97c383ea8..ddd595d0b 100644
--- a/backend/src/http/v1/check_email/post.rs
+++ b/backend/src/http/v1/check_email/post.rs
@@ -17,7 +17,7 @@
 //! This file implements the `POST /v1/check_email` endpoint.
 
 use check_if_email_exists::{check_email, LOG_TARGET};
-use futures::StreamExt;
+use futures::{StreamExt, TryFutureExt};
 use lapin::options::{
 	BasicAckOptions, BasicConsumeOptions, BasicRejectOptions, QueueDeclareOptions,
 };
@@ -33,7 +33,7 @@ use crate::http::v1::bulk::post::publish_task;
 use crate::http::{check_header, ReacherResponseError};
 use crate::worker::consume::MAX_QUEUE_PRIORITY;
 use crate::worker::do_work::{CheckEmailJobId, CheckEmailTask};
-use crate::worker::response::SingleShotReply;
+use crate::worker::single_shot::SingleShotReply;
 
 /// The main endpoint handler that implements the logic of this route.
 async fn http_handler(
@@ -51,8 +51,28 @@ async fn http_handler(
 
 	// If worker mode is disabled, we do a direct check, and skip rabbitmq.
 	if !config.worker.enable {
-		let result = check_email(&body.to_check_email_input(Arc::clone(&config))).await;
-		let result_bz = serde_json::to_vec(&result).map_err(ReacherResponseError::from)?;
+		let input = body.to_check_email_input(Arc::clone(&config));
+		let result = check_email(&input).await;
+		let value = Ok(result);
+
+		// Also store the result "manually", since we don't have a worker.
+		for storage in config.get_storages() {
+			storage
+				.store(
+					&CheckEmailTask {
+						input: input.clone(),
+						job_id: CheckEmailJobId::SingleShot,
+						webhook: None,
+					},
+					&value,
+					storage.get_extra(),
+				)
+				.map_err(ReacherResponseError::from)
+				.await?;
+		}
+
+		let result_bz = serde_json::to_vec(&value).map_err(ReacherResponseError::from)?;
+
 		return Ok(warp::reply::with_header(
 			result_bz,
 			"Content-Type",
diff --git a/backend/src/storage/commercial_license_trial.rs b/backend/src/storage/commercial_license_trial.rs
index 71c3f611d..54a38d79e 100644
--- a/backend/src/storage/commercial_license_trial.rs
+++ b/backend/src/storage/commercial_license_trial.rs
@@ -21,6 +21,7 @@ use crate::worker::do_work::{CheckEmailJobId, CheckEmailTask, TaskError};
 use async_trait::async_trait;
 use check_if_email_exists::{redact, CheckEmailOutput, LOG_TARGET};
 use serde_json::Value;
+use std::any::Any;
 use tracing::debug;
 
 /// Storage that's baked in the software for users of the Commercial License
@@ -101,6 +102,12 @@ impl Storage for CommercialLicenseTrialStorage {
 	fn get_extra(&self) -> Option<serde_json::Value> {
 		self.postgres_storage.get_extra()
 	}
+
+	// This is a workaround to allow downcasting to Any, and should be removed
+	// ref: https://github.com/reacherhq/check-if-email-exists/issues/1544
+	fn as_any(&self) -> &dyn Any {
+		self
+	}
 }
 
 /// Redact all sensitive data by recursively traversing the JSON object.
diff --git a/backend/src/storage/mod.rs b/backend/src/storage/mod.rs
index fcd1afcea..1daa514c5 100644
--- a/backend/src/storage/mod.rs
+++ b/backend/src/storage/mod.rs
@@ -35,4 +35,8 @@ pub trait Storage: Debug + Send + Sync + Any {
 	) -> Result<(), StorageError>;
 
 	fn get_extra(&self) -> Option<serde_json::Value>;
+
+	// This is a workaround to allow downcasting to Any, and should be removed
+	// ref: https://github.com/reacherhq/check-if-email-exists/issues/1544
+	fn as_any(&self) -> &dyn Any;
 }
diff --git a/backend/src/storage/postgres.rs b/backend/src/storage/postgres.rs
index 618c23776..ff0523224 100644
--- a/backend/src/storage/postgres.rs
+++ b/backend/src/storage/postgres.rs
@@ -21,6 +21,7 @@ use async_trait::async_trait;
 use check_if_email_exists::{CheckEmailOutput, LOG_TARGET};
 use sqlx::postgres::PgPoolOptions;
 use sqlx::PgPool;
+use std::any::Any;
 use tracing::{debug, info};
 
 #[derive(Debug)]
@@ -104,4 +105,10 @@ impl Storage for PostgresStorage {
 	fn get_extra(&self) -> Option<serde_json::Value> {
 		self.extra.clone()
 	}
+
+	// This is a workaround to allow downcasting to Any, and should be removed
+	// ref: https://github.com/reacherhq/check-if-email-exists/issues/1544
+	fn as_any(&self) -> &dyn Any {
+		self
+	}
 }
diff --git a/backend/src/worker/consume.rs b/backend/src/worker/consume.rs
index 5dc0d5b78..b46003287 100644
--- a/backend/src/worker/consume.rs
+++ b/backend/src/worker/consume.rs
@@ -15,7 +15,7 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 use super::do_work::{do_check_email_work, CheckEmailTask, TaskError};
-use super::response::send_single_shot_reply;
+use super::single_shot::send_single_shot_reply;
 use crate::config::{BackendConfig, RabbitMQConfig, ThrottleConfig};
 use crate::worker::do_work::CheckEmailJobId;
 use anyhow::Context;
diff --git a/backend/src/worker/do_work.rs b/backend/src/worker/do_work.rs
index 4c530b620..6d7e7dec1 100644
--- a/backend/src/worker/do_work.rs
+++ b/backend/src/worker/do_work.rs
@@ -15,7 +15,7 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 use crate::config::BackendConfig;
-use crate::worker::response::send_single_shot_reply;
+use crate::worker::single_shot::send_single_shot_reply;
 use check_if_email_exists::{
 	check_email, CheckEmailInput, CheckEmailOutput, Reachable, LOG_TARGET,
 };
diff --git a/backend/src/worker/mod.rs b/backend/src/worker/mod.rs
index 90b474c33..bffe565a6 100644
--- a/backend/src/worker/mod.rs
+++ b/backend/src/worker/mod.rs
@@ -22,6 +22,6 @@
 
 pub mod consume;
 pub mod do_work;
-pub mod response;
+pub mod single_shot;
 
 pub use consume::{run_worker, setup_rabbit_mq};
diff --git a/backend/src/worker/response.rs b/backend/src/worker/single_shot.rs
similarity index 100%
rename from backend/src/worker/response.rs
rename to backend/src/worker/single_shot.rs