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docs: clarify ENABLE_MAIL_GZIP guidance (#938)

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Dream Hunter
2026-04-04 19:12:07 +08:00
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commit f08d062b32
4 changed files with 16 additions and 8 deletions
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vitepress-docs/docs/en/guide/worker-vars.md
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@@ -70,9 +70,11 @@
| `FORWARD_ADDRESS_LIST` | JSON | Global forward address list, disabled if not configured, all emails will be forwarded to listed addresses when enabled | `["xxx@xxx.com"]` |
| `REMOVE_EXCEED_SIZE_ATTACHMENT` | Text/JSON | If attachment exceeds 2MB, remove it, email may lose some information due to parsing | `true` |
| `REMOVE_ALL_ATTACHMENT` | Text/JSON | Remove all attachments, email may lose some information due to parsing | `true` |
| `ENABLE_MAIL_GZIP` | Text/JSON | When enabled, new emails are gzip-compressed and stored in `raw_blob` column to save D1 database space. Existing plaintext `raw` data is automatically compatible for reading. **Run database migration first (Admin → DB Migration) to ensure `raw_blob` column exists before enabling** | `true` |
| `ENABLE_MAIL_GZIP` | Text/JSON | When enabled, new emails are gzip-compressed and stored in `raw_blob` column to save D1 database space. Existing plaintext `raw` data is automatically compatible for reading. **Run database migration first (`Admin -> Quick Setup -> Database -> Migrate Database` or `POST /admin/db_migration`) to ensure the `raw_blob` column exists before enabling. This feature adds compression/decompression CPU overhead, so enabling it on a paid Cloudflare Worker plan is recommended.** | `true` |
> [!NOTE]
> `ENABLE_MAIL_GZIP` adds CPU cost for gzip compression on write and decompression on read. Free-tier Workers are more likely to hit CPU limits, so a paid plan is recommended before enabling it
>
> `Junk mail checking` and `attachment removal` require email parsing, free tier CPU is limited, may cause large email parsing timeout
>
> If you want stronger email parsing capabilities