A compromised domain can be warmed back.
After a breach, every legitimate email you send is paying for spam someone else sent under your name: the quote, the invoice, the follow-up. Providers remember it until the evidence changes. Scan with the free tools, fix what broke, then re-warm: an AI Agent on each mailbox rebuilds the reputation with real threads and spam rescue, three to six weeks depending on the damage.
Scan, fix, re-warm. Three steps. Two of them are yours.
The Blacklist Checker runs your domain and IP against 21 lists. The Email Auth Checker reads SPF, DKIM, DMARC, and MX. Both free, no account.
Publish the records the generators write for you, rotate the compromised password, revoke app passwords, and request delisting from each list using its guide.
Connect the mailboxes. An AI Agent on each rebuilds the reputation with real threads and spam rescue, three to six weeks to full volume depending on the damage.
Re-warm: three to six weeks, with spam rescue. Rescues from day one. Placement turns the corner from around week three.
Every rescue from a network spam folder, marked important and read, is a recorded contradiction of the filter's decision.
This is what pulls a flagged domain back. Opens-only warmup cannot do it.
Warming keeps the engagement record ahead of the new volume, so the domain is not flagged again while you rebuild.
What a compromise leaves behind. Four things, and a different fix for each.
A listing is a public verdict, and some providers consult the lists directly. The Blacklist Checker scans 21 of them, and each has a delisting guide.
Blacklist Checker, freeProviders keep the complaint history on the domain, not the mailbox. Rotating the password stops the bleeding. Only fresh engagement changes the record.
Re-warm with spam rescueAn SPF with +all, a missing DMARC, an unsigned DKIM. Tighten all three before warming, or the agent's good mail cannot be told from the bad.
Email Auth Checker, freeThis is the part only warming fixes. Real two-way threads, rescues from spam, and marks as important, recorded per event, are the fresh evidence a filter re-classifies on.
Three to six weeks, with spam rescueRepair it, or start over? Usually repair.
A new domain starts at zero and needs the full ramp anyway, and you lose every address, thread, and signature your customers know. A burned domain with history can be repaired. Start fresh only if it is listed across several blacklists or has been months deep in poor placement.
One or two listings, a clear cause, authentication you can tighten today. Repair keeps the history, the signatures and the address every customer already has.
Listed across several blacklists at once, or months deep in poor placement with no clear cause. Replacing means a new domain, new seats, a full ramp and every contact learning a new address, so do it only then, and warm the new domain from day one.
Scan it yourself. Free, no account. Before anything else, find out what broke.
Your domain and IP against 21 lists, with a delisting guide for each.
SPF, DKIM, DMARC, MX, and BIMI in one run, with what is wrong.
The record to publish, with the policy explained before you pick it.
A tight record for the services you actually send from.
Questions that come up most.
What this page raises, answered plainly.
Can't find it here? Ask the team.
Once the records are fixed and the compromised mailbox is secured, re-warming takes three to six weeks to full volume, depending on the damage. How long the scan and the fixes take is up to you: the free tools give you the answers in minutes.
Bounces for mail you never sent, a sudden blacklist listing, a spike in complaints, or a provider warning. The Blacklist Checker and the Email Auth Checker show the listings and the broken records in one run.
Secure the mailbox first, then keep sending at a low volume you control while warming runs. Cutting to zero teaches the provider nothing. Steady, engaged mail is what changes its mind.
Rarely. A new domain starts at zero and needs the full 21-day ramp anyway, and you lose every address and thread. Start fresh only if the domain is listed across several blacklists or has been months deep in poor placement.
Delisting is something you request from each list yourself, and there is a free guide for each of the 21 lists the Blacklist Checker scans. MailStrike's part is the warming: rebuilding the reputation once the listing is gone.
Tight authentication (a strict SPF, signed DKIM, a DMARC policy that quarantines or rejects), rotated passwords, and OAuth connections you can revoke. MailStrike itself never sees or stores a password.