症状から始める。以下の各行は、直接対処ページへ行きます。
Mail is not arriving
- Nothing new for hours or days. 通常の原因を確認する価値の順序でカバーする、Connection Issues, Sync Failures or Missing Emails]。
- New mail only appears when you open the app, or arrives late. それはアカウントの同期モードです：What are the Notifications Methods? および Android の場合は battery optimization を参照。
- No notifications at all, even though mail arrives. Not Receiving Push Notifications? を参照
- Senders get a bounce message. 送信者のメールはあなたに届く前に拒否され、理由はバウンスにあります： Senders Get a Bounce Message。
A message is missing
- It was there and now it is not. Missing Emails は、3つの一般的な原因を区別します：フィルターで非表示、同期ウィンドウ、別の場所へ移動したメッセージ。
- You deleted it. How to Recover a Deleted Email — ゴミ箱から開始します。ゴミ箱が空にされていなければそこにあります。
- Older mail is absent from a folder. それはフォールダの同期ウィンドウであり、障害ではありません：What is the Days to Sync Option?
- A message opens blank. How to Re-Download an Email、および Offline Storage の自動ダウンロードサイズ制限を確認。
An account will not add
- Start here: Why Won't My Account Add? Quick Fixes は単一の表です — 提供者を探し、変更する1つのことを見つけてください。
- "Setup could not finish" (error 3017). Setup Could Not Finish
- "Unable to connect to server" (error 3011). Unable to Connect to Server
- Incorrect username or password, though it works in webmail. Most providers now require an app-specific password: Bad Username or Password.
- IMAP is switched off at the provider: IMAP Disabled.
- It is a work address. Your employer decides what may connect: Can't Add a Work or Company Email Account.
- The full checklist is Can't Add My Account.
Sending fails
- The message sits in the Outbox. Why Is My Email Stuck in the Outbox? — attachments のサイズが通常の原因です。
- The connection dropped mid-send. What happens if my connection drops while sending?
- You saw an error code. Understanding the SMTP Error Codes
An error code you need explained
- SMTP codes for sending, IMAP codes and POP3 codes for receiving.
- The code appears in the notice BlueMail shows you: for a send failure it is the Error line on the message that moved to Drafts, and for a connection problem it is the number in brackets after Unable to connect to server.
The app itself is misbehaving
- Emails open with an empty body on Android. Usually a beta Android System WebView: Empty Email View.
- A winmail.dat attachment will not open. BlueMail reads these like any other attachment, so this is unusual — it normally means the file arrived damaged. What winmail.dat is and how to open it.
- Crash on Linux, or blurry windows. GPU process crash and Wayland and fractional scaling.
- Norton or Avast on Windows can break the mail connection outright: Disable SSL/TLS scanning for email.
- Things are slow, or the unread count is wrong. Clearing the cache is safe — your mail lives on the server. What happens when I clear the cache? explains exactly what is and is not removed.
Before you change anything
Try the two-minute fixes. Switching between Wi-Fi and mobile data, restarting the device, and updating your password if it changed recently resolve most connection complaints. They are collected in Common Solutions。
Still stuck
Email support@bluemail.me。What helps most:
- your provider, and whether the account is IMAP, POP3 or Exchange
- the exact error text, or a screenshot or screen recording of it
- when it started, and whether it affects one account or all of them
- on iOS, a crash log if the app is closing unexpectedly
