51 lines
1.1 KiB
Python
51 lines
1.1 KiB
Python
 
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"""Reserved localparts that may not be registered (SPEC §4/§6.1).
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Mail-grade from day one: role addresses (RFC 2142) plus common admin/system
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handles. Comparison is case-insensitive; keep entries lowercase.
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"""
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from __future__ import annotations
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RESERVED_LOCALPARTS: frozenset[str] = frozenset(
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{
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# RFC 2142 role addresses
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"postmaster",
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"abuse",
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"hostmaster",
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"webmaster",
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"usenet",
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"news",
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"www",
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"uucp",
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"ftp",
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"noc",
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"security",
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"mailer-daemon",
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# Common system/admin handles
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"admin",
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"administrator",
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"root",
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"noreply",
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"no-reply",
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"donotreply",
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"do-not-reply",
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"support",
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"help",
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"info",
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"contact",
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"sales",
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"billing",
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"system",
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"daemon",
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"nobody",
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"null",
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"void",
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"test",
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}
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)
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def is_reserved(localpart: str) -> bool:
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"""Return True if ``localpart`` is reserved (case-insensitive)."""
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return localpart.lower() in RESERVED_LOCALPARTS
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