# IMAP Quoted-Printable JWT Token Extraction

## Problem
Verification emails often contain JWT tokens in URLs that are split across multiple lines due to quoted-printable encoding. The `=` at end of line is a soft break.

## Example

Raw email content:
```
token=[REDACTED]
eyJlbWFpbCI6Im...\r\n
3ODQ3NDM1Mzd9.qiOoGUNZZsPse1jQnZ8JHvUrb6xKX5KbPatfwvXUPGA&callbackURL=3D%2F
```

## Extraction Code

```python
import imaplib, re

M = imaplib.IMAP4_SSL('imap.gmail.com')
M.login(email, app_password)
M.select('INBOX')
typ, data = M.search(None, 'FROM', 'sender')
ids = data[0].split() if data[0] else []
typ, msg = M.fetch(ids[-1], '(RFC822)')
raw = msg[0][1]

# Find token= in raw bytes
idx = raw.find(b'token=')
chunk = raw[idx+6:idx+250]  # skip 'token='

# Remove soft breaks (=\r\n)
result = []
i = 0
while i < len(chunk):
    if chunk[i:i+1] == b'&':
        break
    if i+2 < len(chunk) and chunk[i:i+3] == b'=\r\n':
        i += 3  # skip soft break
    elif i+1 < len(chunk) and chunk[i:i+1] == b'=' and chunk[i+1:i+2] == b'\r':
        i += 3
    else:
        result.append(chr(chunk[i]))
        i += 1

token = ''.join(result)
# Remove 3D prefix if present (= in quoted-printable)
if token.startswith('3D'):
    token = [REDACTED]]
```

## Important
- Python's `repr()` truncates long strings with `...` — the actual string is complete
- The `3D` prefix is the quoted-printable encoding of `=`
- Always work with raw bytes, not decoded text, to avoid encoding issues
- Use `b'...'` byte strings for searching in raw email content