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Email six people at one company on the same morning and you've built a spam-report voting bloc, they forward, compare, and one click at their gateway can junk your domain for the whole org. Our fleet rule: max 3-4 contacts per company, staggered, with a company-wide stop on any reply. Here's the full playbook.

Maximum 3-4 contacts per company, each started 2-3 business days apart with genuinely different role-specific copy, and a company-wide stop the moment anyone replies, including sequences already running to their colleagues. The risk isn't just annoyance: everyone at the company shares one mail filter, so your sends to them aggregate into one pattern, and one spam report can junk your domain org-wide.
The humans: colleagues forward cold emails, "did you get this too?" is a real Slack message happening about your campaign. Two people comparing identical templates with swapped first names have concrete evidence you're a mail merge, and a small internal consensus that you're spam converts into multiple reports at once. The machines: those recipients share infrastructure. Google Workspace, Microsoft 365, and gateways like Proofpoint score senders per-org, apply org-level rules, and see your six "separate" sends as one burst from one unknown domain to one customer. This is also where gateway-protected companies deserve extra caution, the gateway's verdict covers everyone behind it.
Day 0 Contact A (primary decision-maker), sequence starts
Day 2-3 Contact B (adjacent stakeholder) , different angle
Day 5-6 Contact C (one level up/down) , different angle
Hard cap: 4 contacts. Different send times each.
ANY reply from anyone →
stop ALL sequences at that company, mid-flight included
suppress the domain for this campaign
continue only inside the live thread
All silent after full sequences →
rest the account ~a quarter; return with a new offer,
not a fifth name from the same export.Our fleet rule: 3-4 maximum per company, ever, per campaign motion, and never simultaneously. Beyond that you're not multi-threading, you're carpet-bombing: recipients at the same company talk, forward, and compare, and their shared mail filter sees every one of your sends to that domain as one aggregated pattern. Two or three well-chosen roles usually covers the real buying committee for a cold motion anyway.
Because the receiving side aggregates what your side sends separately. All recipients at a company share one mail environment (Google Workspace, M365, or a gateway), so six identical-shaped emails from one unknown domain in one morning is a visible blast pattern to that filter, and one recipient hitting 'report spam' influences placement for the entire org. Corporate filters also apply org-wide rules: one bad signal can junk your domain for every future recipient there.
2-3 business days between each contact at the same company, different send times of day, and meaningfully different copy per person (role-specific angle, not the same template with a new first name, colleagues DO forward these to each other). The stagger both breaks the blast pattern at the filter and gives each thread room to get a reply before the next one starts.
Everything else at that company stops, immediately, automatically, including sequences already mid-flight for their colleagues. A reply (even a no) means the account is now in conversation: a colleague receiving touch 2 of your sequence after their coworker already answered you reads as sloppy at best and dishonest at worst, and it's the classic trigger for the 'we're all getting these' internal thread that ends in a spam report. Most sequencers support company/domain-level stop rules; turn them on.
The likely decision-maker, one level up or down from them, and at most one adjacent function, chosen because each has a plausible role-specific reason to care, not because they were the top four rows in the data export. If the first three angles at a company all go silent, a fourth identical attempt rarely converts: mark the account, rest it for a quarter, and come back with a different offer or trigger event rather than more names.
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