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- Fix command injection in relay config: use shlex.quote() on all subprocess arguments passed to mailUtilities.py - Fix XSS in email reply/forward: html.escape() on From/To/Date/Subject headers before embedding in quoted HTML - Fix attachment filename traversal: use os.path.basename() and strip null bytes from attachment filenames - Fix Sieve script name injection: sanitize names to alphanumeric chars - Fix SSRF in image proxy: resolve hostname to IP and check against ipaddress.is_private/is_loopback/is_link_local/is_reserved - Remove internal error details from user-facing responses - Update Access Webmail link from /snappymail/ to /webmail/