A Spamhaus SBL or DBL listing can block delivery to a large share of the internet within hours.
Mistake 1: Requesting delisting before fixing the cause; repeat listings become harder to remove#
Why it hurts: this undermines email blocklists at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Check your IPs and domains against major blocklists weekly.
Mistake 2: Ignoring minor blocklists that some corporate gateways still use#
Why it hurts: this undermines email blocklists at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Identify the cause: compromised account, list purchase, spam trap hits, or a misconfigured forwarder.
Frequently asked questions#
How long does Spamhaus delisting take?
Often within hours for SBL and CSS if the cause is fixed. DBL domain listings can take longer.
Which blocklists matter most?
Spamhaus (SBL, XBL, DBL), SpamCop, Barracuda, and SURBL have the widest impact.