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12345678910// SPDX-License-Identifier: AGPL-3.0-or-later
export function extractEmailDomain(email: string | null | undefined): string | null { const normalized = email?.trim().toLowerCase(); if (!normalized) return null; const atIndex = normalized.lastIndexOf('@'); if (atIndex <= 0 || atIndex === normalized.length - 1) return null; return normalized.slice(atIndex + 1);}