How to Get Your IP or Domain Removed From an Email Blacklist

"My email is going to spam" and "my IP is blacklisted" are different problems with different fixes. Before doing anything else, check whether your sending IP (not just your domain) actually appears on a real DNSBL, using an independent multi-list checker such as MX Toolbox's blacklist check. A single obscure list with almost no adoption is a very different problem to being listed on Spamhaus or SpamCop, which are checked by large numbers of receiving servers.

If nothing shows up on a reputable checker, your delivery problem is more likely authentication (SPF/DKIM/DMARC), content, or reputation-based filtering rather than a blocklist — see the email deliverability guide instead.

Most DNSBL listings are not random. Common causes, roughly in order of likelihood for a small business server:

• A compromised account. A single user's mailbox or webmail login sending spam is the most common cause on small servers — check for one account sending an unusual volume before you look anywhere else.
• An open or misconfigured relay. A relay that accepts mail from anyone and forwards it to anyone will be found and abused, usually within days.
• Shared IP reputation. If you are on a shared hosting or VPS IP, someone else's abuse can get your IP listed even though you did nothing wrong.
• A genuinely dirty list. Sending to a purchased, scraped, or very old list will hit spam-trap addresses that some blocklists use specifically to catch this.
• Excessive volume with no warm-up. Some lists flag a sudden jump in sending volume from a previously quiet IP.

Check your outbound mail logs for the period just before the listing. Almost every DNSBL provides a lookup page that shows roughly when and sometimes why an IP was listed.

Requesting removal before the cause is fixed almost always results in being relisted, sometimes within hours. Depending on what you found:

• Reset the password on any account that was sending abnormal volume, and check for forwarding rules or compromised app passwords an attacker may have added.
• Confirm your SMTP server requires authentication for relay and does not accept mail from unauthenticated senders for domains it does not host — an open relay must be closed, not just apologised for.
• Remove hard-bounced and clearly invalid addresses from any list you send to.
• If you are on shared infrastructure, ask the provider whether the listing is tied to your specific IP or a shared range.

Each DNSBL operator runs its own delisting process, and these change over time, so always use the removal page linked from the list's own lookup result rather than a third-party "blacklist removal service" — most of those add no value you cannot get for free directly from the list operator, and some are scams.

Generally you will need to:

1. Look up the specific list your IP appears on (there are dozens; only fix the ones actually flagging you).
2. Follow that operator's own delisting/removal request page.
3. Briefly and honestly describe what caused the listing and what you changed — vague or defensive requests are reviewed more slowly, if at all.
4. Wait — some lists delist automatically after a period of clean sending; others review requests manually and can take days.

If you send meaningful volume to Gmail, Outlook.com or Yahoo addresses, also check Google Postmaster Tools and Microsoft's SNDS/JMRP tools — these providers make their own filtering decisions independently of public DNSBLs.

A blacklisting is a symptom. The fixes that actually prevent a repeat are usually operational rather than technical:

• Require strong authentication and, where possible, multi-factor authentication on mailboxes that can relay outbound mail.
• Watch outbound volume per account, not just total server volume — one account sending 10x its normal traffic is the earliest warning sign.
• Keep an eye on bounce rate; a rising bounce rate on a legitimate list is often the first symptom of an ageing or scraped address list.
• Review who and what is authorised to relay through the server periodically, especially after staff changes.

Hexamail Guard checks inbound mail against DNSBL/RHSBL/SURBL lists as part of its normal filtering, and its outbound scanning and per-account volume visibility can surface a compromised mailbox or a misbehaving relay client before it gets your IP listed in the first place. It does not talk to blocklist operators on your behalf — that request always has to come from you, directly, to each list.