How Auto-Delivery Works on MangaSendr (2026 Guide)

Auto-delivery is the feature that lets you stop checking manga sites manually. You add a series once. From that point on, MangaSendr's servers watch the source for you, and the moment a new chapter drops, it lands on your Kindle as an optimized EPUB — no app to launch, no button to press.

This guide walks through exactly what happens behind the scenes, what knobs you can turn, and what to expect on the free tier.

The 60-second version

1. You add a manga source from any reader site.
2. Every 6, 12, or 24 hours (depending on your plan), MangaSendr re-scrapes the source.
3. New chapters detected → converted to a Kindle-friendly EPUB → emailed to your Kindle.
4. You wake up. New chapter is on the device.

That's it. The rest of this page is the details for people who like to know how the sausage is made.

What "auto-delivery" actually means

Auto-delivery is two separate things working together:

Background sync — A scheduled job on our servers that checks every source you've added for new chapters. It uses the same parser you used when you first added the source, falling back to a generic parser if needed.

Silent delivery — When the background sync finds new chapters, it automatically packages them into an EPUB, optimizes the images for E-Ink (sharpening, dithering, contrast), and sends the file to your Kindle email address.

You enable auto-delivery on a per-device basis. Every Kindle you've registered has an "Auto-deliver new chapters" checkbox in its device settings. By default it's on for new devices.

How often does the system check?

That depends on your plan.

Free tier — Sources are checked every 12 hours. This is fixed. You cannot change it.

Subscribed — You pick from 6h (default), 12h, or 24h in Settings → Preferences → Update Frequency. Six hours is the minimum, because more frequent checks would put unnecessary load on the source sites.

There's also an automatic backoff if a source starts failing. After 3 consecutive sync failures, MangaSendr checks that source half as often. After 6, four times less often. After 10, the source is paused entirely until you hit "Refresh chapters" manually.

How "new chapter" detection works

The system keeps track of every chapter URL (website address) it has ever seen for each of your sources. When it re-scrapes, it diffs the new URL list against the stored one. Any URL it hasn't seen before is treated as a new chapter and gets queued for delivery.

This means:

• If a chapter gets re-uploaded at the same URL, it won't be re-delivered.
• If a parser fix lets us discover chapters that were missed, those will appear automatically on the next sync.
• Marking a chapter as "read" removes it from the auto-delivery queue.

The 10-chapter spam guard

If a series has 10 or more unread chapters, auto-delivery skips it entirely until you catch up. The reasoning: 10+ unread chapters usually means you've stopped actively reading, and waking up to 30 chapters of One Piece on your Kindle isn't helpful.

To resume auto-delivery on a stalled series, mark some chapters as read or send a few manually. Once unread drops below 10, the next sync will pick it up again.

Multi-device fan-out

If you have more than one Kindle registered with auto-delivery enabled, each new chapter gets delivered to all of them. Useful if you read on a Paperwhite at home and a Scribe on the train.

Note: each device delivery counts separately against the free-tier quota (see below).

The free tier and auto-delivery

Free accounts get 3 free deliveries, total. This applies to both manual deliveries and auto-deliveries — they share the same pool.

Practically:

• A free user with 3 sources, each getting 1 new chapter in a single sync, will receive all 3 to their Kindle and then hit the cap.
• Once you're at 0 remaining, auto-delivery stops creating jobs for you. We don't even start scraping the source — the system bails out cheaply.
• Subscribing instantly removes the cap. Your existing sources resume on the very next sync tick.

We surface this in two places: the device settings page shows a warning banner under the auto-delivery checkbox when you're on the free tier, and the dashboard shows your remaining deliveries badge.

Where to see what auto-delivery is doing

Source detail page — Each manga shows a small status pill: "Synced 2h ago · Next check in 4h" if everything's healthy, or an amber/red warning if backoff is active.

Delivery history page — Auto-deliveries are flagged with a small "Auto" badge next to the manga title. You can also filter the entire list to show only manual or only auto deliveries.

Discord notifications — Admins (us) get pings on auto-delivery starts, completions, failures, and free-tier blocks. We use them to spot parser regressions early.

What can go wrong

The source site adds an anti-bot challenge. If we can't scrape it, the sync fails. After 3 fails the source enters backoff mode; after 10 it pauses entirely. Hitting "Refresh chapters" manually resets the counter.

A chapter has too many pages to fit in one email. Amazon caps Kindle email attachments at ~50MB. We split oversized chapters into multiple parts automatically — you'll see "Vol 1 (1 of 3)" etc. on the device.

The parser drifts. If the source site re-skins its layout, the saved parser may stop finding chapters. We have a fallback parser that kicks in when the saved one returns suspiciously few results, and we periodically bump a global parser version to force a recovery sweep on all sources.

Disabling auto-delivery

You can turn auto-delivery off on a per-device basis. Go to Settings → Devices → Edit, and uncheck "Auto-deliver new chapters." Background sync still happens (so you'll see new chapters in your library), but nothing gets emailed to that device until you flip it back on.

If you want to pause sync entirely for a specific source, the closest thing is removing it from your library — we don't currently have a per-source pause toggle.

TL;DR

Auto-delivery is the entire reason MangaSendr exists. You set it up once, and it does the work. Free users get 3 deliveries to try it; subscribers get unlimited and the ability to tune the check frequency. Everything else — sync failures, oversized files, multi-device fan-out, the 10-chapter spam guard — handles itself.

Get started with 3 free deliveries →