The email seed list that rescues your mail from spam.
Drop monitored seed addresses into any campaign. When your mail lands in spam, our engagement AI moves it to the inbox, marks it not spam, and reads it, while the sequence is still running.
The blind spot
You find out about spam after the campaign fails.
Open rates halve, replies stop, and by the time the pattern is obvious the sequence has finished and the list is burned.
Seed lists put MailStrike inside the inbox.
Monitored addresses ride along in your recipient list. When your mail lands in spam they pull it out, mark it not spam, and engage, while the campaign is still running.
The blind spot
You find out about spam after the campaign fails.
Open rates halve, replies stop, and by the time the pattern is obvious the sequence has finished and the list is burned.
Seed lists put MailStrike inside the inbox.
Monitored addresses ride along in your recipient list. When your mail lands in spam they pull it out, mark it not spam, and engage, while the campaign is still running.
How MailStrike Seed Lists work
Seeds ride inside your real campaigns
Drop MailStrike's monitored addresses into any recipient list and send like you normally would. Seeds receive exactly what your prospects receive, from the same domain, through the same tool.
Mail in spam gets pulled out
When your campaign lands in a seed's spam folder, the AI moves it to the inbox and marks it not spam. That correction directly contradicts the filter's verdict, and providers record it against your domain.
Then engaged like a real recipient
Seeds open your mail, read it for varied, human-like durations, click through, and file it as important. They never reply, so your sequencer's follow-ups and your reply stats stay untouched.
And you finally see where mail lands
Every send produces a per-provider placement read across Gmail, Outlook, and Yahoo. Placement is rarely uniform, and knowing which provider is burying you changes the fix.
Most seed lists tell you where your mail landed. MailStrike's moves it.
See the engagement engine behind itWhat is an email seed list?
A set of real, monitored email addresses you add to a campaign's recipient list to see, and with MailStrike to fix, where your mail actually lands.
Seed addresses
Real inboxes on Gmail, Outlook, Yahoo, and other providers, owned and monitored by MailStrike. To your sending tool they are ordinary recipients.
Placement testing
The traditional use. Seeds report which folder your mail reached (Primary, Promotions, spam) so you get a per-provider placement read instead of guessing from open rates.
Active rescue
The MailStrike difference. Mail that reaches a seed's spam folder is moved to the inbox, marked not spam, and engaged. Passive seed tests only observe; ours correct.
Engagement signals
Opens, realistic read time, link clicks, and importance markers: the post-delivery behaviour providers weigh heavily when classifying your next send. Seeds never reply, so nothing interferes with your sequences.
Domain matching
You verify your domain once with a DNS TXT record. Incoming mail is matched by domain and DKIM signature, so seeds only ever engage mail that is genuinely yours.
Seeds vs. warmup
Warming builds reputation with generated conversations before and between campaigns. Seed lists work inside the campaigns themselves. They stack: one builds the record, the other protects the send.
Live inside one send cycle.
No API keys and no integration project. If your tool can send email to a list of addresses, it can use a seed list.
Pick a seed allocation
Choose a tier sized to your monthly sending volume. Your seeds are spread across Gmail, Outlook, Yahoo, and other providers so every send gets a read at each one.
Verify your sending domain
Add one DNS TXT record, the same kind of change as an SPF update. From then on we match incoming mail by your domain and its DKIM signature, so only your campaigns are engaged.
Add seeds to your recipient list
Export the addresses and drop them into the campaign in your sequencer or ESP. No API keys, no OAuth, nothing to install. Then send as normal.
Rescue and engagement run automatically
As your mail arrives, anything in spam is rescued and everything else is opened, read, and marked. The placement report updates live, and the record builds with every send.
Why senders add seeds to every campaign.
Rescue while the campaign is still live
The sequence you are sending this week is the one being saved. No waiting for a post-mortem after open rates crater, and no writing off a burned list.
A per-provider read on placement
See where mail actually lands at Gmail, Outlook, and Yahoo instead of inferring it from open rates. A domain can be fine at Google and buried at Microsoft, and the fix is different for each.
Reputation that compounds as you send
Every rescue, open, and click is engagement evidence recorded against your domain. Each campaign starts from a slightly better position than the last one did.
Sequences that run their full course
Seeds never reply, so your sequencer never cuts a follow-up short on their account, and your reply rate reflects real prospects only.
Zero change to your sending stack
Seeds are ordinary addresses in your recipient list. Keep your sequencer, your ESP, your templates, and your schedule exactly as they are.
Works with whatever you send from.
Drop seeds into any tool that sends email
Seed addresses are ordinary recipients. Cold outbound, marketing sends, transactional mail: if it has a recipient list, seeds can ride along.
Seeds protect the send. Warming builds the sender.
Seed lists defend live campaigns. Persona warming builds the underlying reputation before and between them. Together they cover the whole lifecycle.
AI Email Warmup
How persona-driven warming builds sender reputation with real two-way threads before you ever hit send.
Getting out of spam
The recovery playbook for a flagged domain, and where rescues fit into it.
Why are my emails going to spam?
The ten most common causes, with the fix for each. A five-minute read.
Seed list questions.
What is an email seed list?
A seed list is a set of real, monitored email addresses that you add to your campaign's recipient list. Because MailStrike controls those inboxes, we can see exactly which folder your mail lands in at each provider and act on it: moving messages out of spam, marking them not spam, and engaging with them the way a real recipient would.
How is a seed list different from email warmup?
Warmup builds sender reputation with generated conversations before and between campaigns. A seed list works inside the campaigns you were already sending: it measures placement and generates corrective signals on your real mail. Most senders run both. Warming establishes the reputation, seeds protect it while you send.
How many seed addresses do I need?
Enough to get a reliable read at each provider you care about, scaled to your send volume. A small campaign might embed a dozen seeds across Gmail, Outlook, and Yahoo, while high-volume senders spread larger allocations across every send. MailStrike tiers are sized by monthly sending volume, so the allocation grows with you.
Do spam rescues actually improve deliverability?
Yes. When a recipient finds a message in spam and moves it to the inbox or marks it not spam, the provider records a direct correction against the sender. It is one of the strongest positive signals available because it explicitly contradicts the filter's decision. Repeated across sends, those corrections shift how your future mail is classified.
Will seeds skew my campaign statistics?
You always know exactly which addresses are seeds, so they are easy to exclude from campaign reporting, and their volume is small relative to a real send. Because seeds never reply, your reply rate and your sequencer's follow-up logic are completely unaffected.
Do seeds reply to my emails?
No, and that is deliberate. Seeds open, read, click, rescue, and mark your mail, but they never write back. Most sequencers stop a sequence the moment a contact replies, so a replying seed would cut your follow-ups short and inflate your reply rate. All engagement happens on the receiving side.
Which providers do the seed addresses cover?
Consumer Gmail and Google Workspace, Outlook.com and Microsoft 365, and Yahoo, with more surfaces on the way. Placement is rarely uniform across providers, and a per-provider read usually reveals which one is actually hurting you.
Do I need to change my sending tool?
No. Seed addresses are ordinary recipients. Export them, add them to your campaign in Instantly, Smartlead, lemlist, HubSpot, Mailchimp, or anything else that sends email, and send as normal. There is no API to wire up and nothing to install.
How does MailStrike know which mail is mine?
You verify your sending domain once with a DNS TXT record. From then on, incoming mail at the seed inboxes is matched by your domain and its DKIM signature. Seeds only rescue and engage mail that is verifiably yours, so nobody can piggyback on your allocation.
Is using a seed list safe?
Yes. The seed inboxes belong to MailStrike's network and exist to receive your mail, so no real prospect's mailbox is ever touched. You are sending normal campaigns to addresses that expect them, and engagement happens on the receiving side, in inboxes we operate, at a human-like pace.
How do I get started?
Book a call and we will size a seed allocation to your sending volume. Setup is a single DNS TXT record to verify your domain, and you can drop seeds into your next campaign the same day.
Don't let the next send land in spam.
Talk to us about where seeds fit in your deliverability setup. You can be sending over seeds this week.