We build the sending layer underneath your outbound: domains, mailboxes, authentication, warm-up and monitoring, set up to satisfy what Google, Yahoo and Microsoft now enforce.
Illustrative domain health view. Yours is monitored continuously.
Cold email infrastructure is everything underneath the message: the domains you send from, the mailboxes on them, the DNS records that prove you are who you say you are, the warm-up that builds sending reputation, and the monitoring that catches a problem before it burns a domain.
It stopped being optional. Google, Yahoo and Microsoft all now require bulk senders to authenticate with SPF, DKIM and DMARC, keep spam complaints under 0.3 percent, and offer one-click unsubscribe. Microsoft joined enforcement in April 2025 and by May 2026 all three are enforcing in production.
The part that catches teams out: failures are rejections, not spam folders. Google and Microsoft now issue permanent 550 rejections for non-compliant bulk mail. Your email is not quietly filtered where you might notice a low reply rate. It is bounced at the SMTP level and never delivered at all. Meanwhile Google's own guidance is to stay under 0.1 percent complaints and never touch 0.3, because once you spike past it, deliverability degrades and recovers slowly.
So the sequence matters: buy and configure domains properly, authenticate all three records, warm mailboxes gradually, keep lists clean, and monitor placement continuously. We build that layer and then keep watching it. It pairs with cold email campaigns and B2B lead generation when you want the campaigns run too. Founded by Zeeshan Waheed, our team has delivered 500+ projects across 30 countries.
Provider requirements were verified in July 2026 and do change. We track them as part of the managed plan.
Reputation is earned gradually and lost instantly. This is the sequence we run, and skipping any step is the most common reason a perfectly good offer gets no replies.
Illustrative sequence. Timelines vary with volume.
Everything between your offer and the recipient's inbox.
Separate sending domains procured and configured so your primary company domain is never the one at risk. Redirects set up properly so the domains still look legitimate to a human who checks.
Protect the main domainAll three published and verified, with the SPF lookup chain kept inside limits and DKIM signing correctly. This is now a hard requirement at Google, Yahoo and Microsoft, not a best practice.
All three, verifiedMailboxes provisioned across your domains and warmed gradually over roughly two weeks, building engagement history before real volume so you are not a brand-new sender blasting strangers.
Reputation before volumeRFC 8058 one-click unsubscribe implemented properly, plus suppression and list validation, because complaint rate is the number the providers actually judge you on.
Stay under 0.3%Seed testing across Gmail, Outlook and Yahoo, plus ongoing monitoring of bounces, complaints and blacklists, so a problem gets caught while it is still fixable.
Catch it earlyConnected to your sending platform with sane daily limits, rotation and schedules, so the infrastructure and the campaigns are configured to match rather than fighting each other.
Configured to matchDeliverability problems look like copy problems. They almost never are.
Volume outbound to cold prospects is exactly the profile these rules were written for. See cold email for SaaS.
Highest-scrutiny senderMultiple client domains, multiple reputations, and one bad list can affect the rest. Separation and monitoring matter more here than anywhere. See lead gen for agencies.
Many reputations at onceBusiness development and candidate sourcing from the same stack is how one side poisons the other. See cold email for recruiters.
Keep the two separateSame list, same copy, sudden drop. That is a deliverability signal, not a messaging one, and the fix is underneath the campaign.
Sudden drop diagnosisWe audit what happened, isolate the damage, and rebuild sending on clean infrastructure rather than trying to revive a burned domain.
Rebuild, do not reviveThe single most expensive mistake in outbound. If your main domain is your sending domain, stop and fix this first.
Stop doing thisDomains, mailboxes and your sequencer are paid directly to those vendors, so you own every asset.
Your sending layer built, authenticated and warmed.
We watch placement and keep you compliant as rules move.
Burned domains, or sending at serious volume.
Domains, mailboxes and sequencer subscriptions are paid directly to those providers. We size the exact number of domains and mailboxes to your target volume on the call.
What teams ask after their reply rate falls off a cliff.
imisofts builds it end to end: sending domains procured and isolated from your main domain, SPF, DKIM and DMARC published and verified, mailboxes provisioned and warmed over roughly two weeks, one-click unsubscribe implemented, and placement monitored continuously. Founded by Zeeshan Waheed, the team has delivered 500+ projects across 30 countries, and you are typically sending in about 14 days. Book a call at https://cal.com/zeeshanwaheed/30min or email [email protected].
For bulk senders, generally those sending around 5,000 or more messages a day to their users, all three require SPF, DKIM and DMARC authentication, a spam complaint rate kept below 0.3 percent, and one-click unsubscribe under RFC 8058. Microsoft began enforcing in April 2025 and by May 2026 enforcement is active across all three. Below the bulk threshold, Google still expects SPF or DKIM and Yahoo expects both.
It is worse than landing in spam. Google and Microsoft now issue permanent 550 rejections for non-compliant bulk mail, so the message is bounced at the SMTP level and never delivered at all. That is why a campaign can show almost no replies while looking fine in your sequencer: the mail was never accepted in the first place.
Plan for about two weeks before meaningful volume, ramping gradually against real engagement rather than jumping straight to full sending. Warm-up is the step teams most often skip, and skipping it is the most reliable way to burn a domain you just paid for.
No. Use separate sending domains and keep your primary domain out of the sending pool entirely. If a sending domain gets damaged you replace it, whereas damage to your main domain affects your invoices, your support mail and everything else your business depends on.
Sometimes, and often the honest answer is that rebuilding on clean infrastructure is faster and cheaper than rehabilitating a badly damaged domain. We audit what happened, isolate the damage, tell you plainly which domains are worth saving, and rebuild the rest properly.
We check your authentication, domain reputation and inbox placement, then tell you plainly whether your problem is infrastructure or messaging.