چک لیست سیاه ابزاری است که آدرس IP سرور ایمیل را با ارجاع متقابل به بیش از 100 لیست سیاه ایمیل مبتنی بر DNS که اغلب به عنوان لیست سیاه بیدرنگ، DNSBL یا RBL نامیده می شود، ارزیابی می کند. هنگامی که آدرس IP سرور ایمیل در لیست سیاه قرار می گیرد، این خطر وجود دارد که برخی از ایمیل های ارسال شده از آن سرور به گیرندگان مورد نظر خود نرسند.
این لیست های سیاه ایمیل به عنوان روشی پرکاربرد برای به حداقل رساندن تاثیر ایمیل های اسپم عمل می کنند.
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