Email deliverability monitoring tools

Email deliverability is a key factor in the success of any email campaign. To ensure your emails land in recipients’ inboxes rather than their spam folders, it’s important to regularly monitor various deliverability metrics. Fortunately, there are several tools that can help. Below is a list of recommended tools for monitoring deliverability and how you can use them.

FBL List (Feedback Loop)

Seznam.cz offers a Feedback Loop (FBL) tool that provides feedback on how recipients respond to your emails. This tool lets you find out which recipients mark your messages as spam, helping you identify problematic mailing lists and adjust your strategy to improve deliverability and reduce spam complaints.

  • Suitable for: Senders who have a large number of recipients with email addresses on Seznam.cz.
  • Features: Spam complaint tracking, deliverability feedback, ability to remove problematic addresses.
  • Website: Seznam FBL

Google Postmaster Tools

Google Postmaster Tools is a Google tool that lets email senders monitor deliverability metrics on Gmail. You can track spam rate, domain and IP reputation, email authentication (SPF, DKIM), and other critical factors.

  • Suitable for: Senders with many recipients using Gmail.
  • Features: Displays domain and IP reputation, spam rate, and authentication messages.
  • Website: Google Postmaster Tools

MxToolbox

MxToolbox is a tool for monitoring and diagnosing DNS records and the reputation of IP addresses and domains. It lets you check whether your domain or IP address is listed on blacklists. This tool is useful for regularly checking that your domain hasn’t lost its reputation.

  • Suitable for: All senders who want an overview of their IP and domain reputation.
  • Features: reputation monitoring, blacklist checks, DNS diagnostics.
  • Website: MxToolbox
Michal Michal Krejčí
8. September 2025