diff --git a/src/queue/index.ts b/src/queue/index.ts
index b4067cd7ce..db1344d2e1 100644
--- a/src/queue/index.ts
+++ b/src/queue/index.ts
@@ -25,6 +25,26 @@ export const deliverQueue = initializeQueue('deliver');
 export const inboxQueue = initializeQueue('inbox');
 export const dbQueue = initializeQueue('db');
 
+deliverQueue
+	.on('waiting', (jobId) => {
+		queueLogger.debug(`[deliver] waiting id=${jobId}`);
+	})
+	.on('active', (job) => {
+		queueLogger.debug(`[deliver] active id=${job.id} to=${job.data.to}`);
+	})
+	.on('completed', (job, result) => {
+		queueLogger.debug(`[deliver] completed(${result}) id=${job.id} to=${job.data.to}`);
+	})
+	.on('failed', (job, err) => {
+		queueLogger.debug(`[deliver] failed(${err}) id=${job.id} to=${job.data.to}`);
+	})
+	.on('error', (error) => {
+		queueLogger.error(`[deliver] error ${error}`);
+	})
+	.on('stalled', (job) => {
+		queueLogger.warn(`[deliver] stalled id=${job.id} to=${job.data.to}`);
+	});
+
 export function deliver(user: ILocalUser, content: any, to: any) {
 	if (content == null) return null;
 
@@ -38,7 +58,7 @@ export function deliver(user: ILocalUser, content: any, to: any) {
 		attempts: 8,
 		backoff: {
 			type: 'exponential',
-			delay: 1000
+			delay: 60 * 1000
 		},
 		removeOnComplete: true,
 		removeOnFail: true
diff --git a/src/queue/processors/deliver.ts b/src/queue/processors/deliver.ts
index b561f33181..4cb1cfc6bb 100644
--- a/src/queue/processors/deliver.ts
+++ b/src/queue/processors/deliver.ts
@@ -7,7 +7,7 @@ import instanceChart from '../../services/chart/instance';
 
 let latest: string = null;
 
-export default async (job: Bull.Job): Promise<void> => {
+export default async (job: Bull.Job) => {
 	const { host } = new URL(job.data.to);
 
 	try {
@@ -29,6 +29,8 @@ export default async (job: Bull.Job): Promise<void> => {
 
 			instanceChart.requestSent(i.host, true);
 		});
+
+		return 'Success';
 	} catch (res) {
 		// Update stats
 		registerOrFetchInstanceDoc(host).then(i => {
@@ -46,15 +48,19 @@ export default async (job: Bull.Job): Promise<void> => {
 		if (res != null && res.hasOwnProperty('statusCode')) {
 			queueLogger.warn(`deliver failed: ${res.statusCode} ${res.statusMessage} to=${job.data.to}`);
 
+			// 4xx
 			if (res.statusCode >= 400 && res.statusCode < 500) {
 				// HTTPステータスコード4xxはクライアントエラーであり、それはつまり
 				// 何回再送しても成功することはないということなのでエラーにはしないでおく
-				return;
+				return `${res.statusCode} ${res.statusMessage}`;
 			}
 
-			return res.statusMessage;
+			// 5xx etc.
+			throw `${res.statusCode} ${res.statusMessage}`;
 		} else {
+			// DNS error, socket error, timeout ...
 			queueLogger.warn(`deliver failed: ${res} to=${job.data.to}`);
+			throw res;
 		}
 	}
 };