What are the possible reasons for an IP address blacklist? - Online Help | Zoho Campaigns

What are the possible reasons for an IP address blacklist?

An IP address can be blacklisted due to sending spam, high bounce rates, poor list hygiene, spam complaints, or missing email authentication (e.g., SPF, DKIM, DMARC). Other causes include hosting phishing links, sharing an IP with spammers, sudden volume spikes, or using compromised servers. These factors harm sender reputation and email deliverability.

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                                                                                                                        • Related Articles

                                                                                                                        • How to handle a blacklisted sender domain/IP address

                                                                                                                          Blacklists are lists of email senders who are known to send spam. These lists are maintained by internet service providers, anti-spam services, and mailbox providers. When it comes to offering inbox placement, mailbox providers give preference to ...
                                                                                                                        • How can I find the reputation of my dedicated IP address?

                                                                                                                          You can search online for IP address reputation monitoring tools and enter your domain name or IP address to check the current reputation. Some of the tools that you could refer to include Google Postmaster Tools for Gmail users, Sender Score (by ...
                                                                                                                        • What is a dedicated IP address?

                                                                                                                          In Zoho Campaigns, your email campaigns are typically sent from a shared IP, where multiple users share the same IP address. If one user experiences deliverability issues, it can affect the reputation of that IP, impacting all of the other users. A ...
                                                                                                                        • What does IP address whitelisting mean?

                                                                                                                          IP address whitelisting in email marketing means adding a sender’s IP address to a recipient’s approved list, allowing emails from that IP to bypass spam filters. It helps ensure reliable delivery, especially to corporate or strict email servers, and ...
                                                                                                                        • What does a shared IP address mean?

                                                                                                                          In Zoho Campaigns, a shared IP address means multiple users send emails from the same IP. This setup shares sender reputation, so your email deliverability can be affected by other users’ sending behavior and practices.
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