{"id":24890,"date":"2026-07-03T14:41:22","date_gmt":"2026-07-03T12:41:22","guid":{"rendered":"https:\/\/kunskap.websupport.se\/?post_type=ht_kb&p=24890"},"modified":"2026-07-03T14:41:24","modified_gmt":"2026-07-03T12:41:24","slug":"email-domain-security-rbl-and-spf","status":"publish","type":"ht_kb","link":"https:\/\/kunskap.websupport.se\/en\/kb\/email-domain-security-rbl-and-spf\/","title":{"rendered":"Email domain security \u2013 RBL and SPF"},"content":{"rendered":"\n

Under Domain security<\/strong> you manage two protection mechanisms for incoming email: RBL blacklisting and SPF checking. Here we show what they do and how to enable or disable them.<\/p>\n\n\n\n

    \n
  1. Log in to admin.websupport.se<\/a><\/strong>.<\/li>\n\n\n\n
  2. Click the domain name you want to manage.<\/li>\n\n\n\n
  3. Go to Email \u2192 Overview \u2192 Domain security<\/strong>.<\/li>\n<\/ol>\n\n\n\n
    \"\"<\/figure>\n\n\n\n

    RBL \u2013 sender blacklisting<\/h3>\n\n\n\n

    RBL checking compares the sender server against a blocklist. If the server is on the list, the email is marked as SPAM.<\/p>\n\n\n\n

    If legitimate email is blocked, there are two solutions:<\/p>\n\n\n\n

      \n
    1. The administrator of the blacklisted server contacts the blocklist provider to be removed.<\/li>\n\n\n\n
    2. You disable RBL checking \u2013 you then get all email, including spam. Use with caution.<\/li>\n<\/ol>\n\n\n\n

      SPF \u2013 sender domain verification<\/h3>\n\n\n\n

      SPF is a DNS record that specifies which servers can send email from a domain. If SPF checking is enabled and the sender server is not authorized, the sender gets the error: 550 Message rejected because SPF check failed<\/em>.<\/p>\n\n\n\n

      Solutions:<\/p>\n\n\n\n

        \n
      1. The sender adds the correct SPF record to their domain.<\/li>\n\n\n\n
      2. You disable SPF checking \u2013 this can lead to increased spam in the mailboxes under the domain.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

        Under Domain security you manage two protection mechanisms for incoming email: RBL blacklisting and SPF checking. Here we show what they do and how to enable or disable them. RBL \u2013 sender blacklisting RBL checking compares the sender server against a blocklist. If the server is on the list, the…<\/p>\n","protected":false},"author":44,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[393],"ht-kb-tag":[],"class_list":["post-24890","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email"],"yoast_head":"\nEmail domain security \u2013 RBL and SPF - Websupport kunskapsdatabas<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kunskap.websupport.se\/en\/kb\/email-domain-security-rbl-and-spf\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Email domain security \u2013 RBL and SPF - Websupport kunskapsdatabas\" \/>\n<meta property=\"og:description\" content=\"Under Domain security you manage two protection mechanisms for incoming email: RBL blacklisting and SPF checking. 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