Email Providers

I burned through $15K perfecting cold email copy. Here's what I learned when I focused on deliverability instead. While I was obsessing over subject lines and CTAs, most of my emails were landing in spam folders. I had killer copy that nobody ever saw. But here's what happened when I fixed the infrastructure piece first… I went from ignored emails to 800,000+ monthly sends at ColdIQ. If your cold emails aren't working, deliverability beats copy every single time. WHY DELIVERABILITY IS EVERYTHING: 1. Perfect copy means nothing in spam. You can have killer targeting, perfect messaging, incredible offers... but if your email lands in spam? Game over. 2. It compounds everything else. Once your domain reputation is down, even your transactional emails start getting flagged and won't get delivered anymore. So how do you make your email in the primary? 1. Protect your main domain. Never send cold emails from your primary domain. We use 70+ secondary domains to keep our brand safe and our main inbox clean. 2. Distribute volume across multiple mailboxes. Set up 140+ mailboxes across those domains. Keep it under 50 sends per day per domain. High volume too early = instant red flag. 3. Get your technical foundation bulletproof. Set up SPF, DKIM, and DMARC authentication. Without proper technical set-up, you're flagged as suspicious by default. 4. Warm up. Send nothing for 2 weeks. Use premium warm-up tools to build trust gradually with ESPs. Ramp slowly to avoid triggering their spam filters. Patience here pays dividends later. 5. Natural variation. Use Spintax or tools like Twain to introduce variations in your messaging. Even small variations help you avoid the repetition triggers that scream "mass email blast" to spam filters. Remember, list quality plus message still matter most. Even with perfect infrastructure, if your list is off and your message is weak, you'll still land in spam. Deliverability gets you to the inbox, but the relevance keeps you there. Monitor everything rigorously. Use tools to track your sender reputation across all ESPs. We check deliverability rates daily (it's that critical). Infrastructure gets you to the inbox, but your targeting plus messaging determines what happens next. I've put together a 7-day GTM crash course that includes our exact setup, authentication templates, and the monitoring systems we use to protect the campaigns of our 70 clients. Reply with "SETUP" if you want access before your next campaign goes live.

Cold email has quietly gotten a lot harder. Not because buyers suddenly hate email, but because email service providers have changed the rules. Gmail, Outlook, and others are cracking down hard on outbound. More emails are getting routed to spam or promotions, sender reputation scores are tanking faster, and GTM teams are paying the price with lower reply rates and fewer real conversations. What worked even 12-18 months ago no longer does. A few things driving this shift: -ESPs now prioritize recipient engagement over sender intent -Poor targeting and mass blasts get punished almost immediately -One bad campaign can damage an entire domain’s reputation The result: even strong sales teams struggle just to get seen. A few small things that actually help right now: -Personalize beyond the first name: Reference something specific and relevant. Generic personalization no longer cuts it. -Refine targeting: Smaller, cleaner lists consistently outperform large, unfocused ones. -Get the technical setup right: Proper MX, DMARC, DKIM, and SPF configuration is now table stakes. -Validate contacts aggressively: High bounce rates will tank sender reputation fast. -Send like a human: Avoid massive blasts. Ramp volume gradually and mimic real human sending patterns. -Be careful how you warm up domains: Public warm up pools often have poor hygiene. If you are warming alongside bad actors, you inherit their problems. Private, well monitored warm up pools reduce that risk significantly. Email still works. It is just far less forgiving. At SendtoWin, we offer email deliverability as a service to support GTM teams who want outbound to actually reach the inbox again, without their sales team fighting invisible headwinds. #Sales #Prospecting #GTM

Most of the senders I talk to are running email on top of infrastructure that wasn't really designed for how their business works today. They’re juggling: - Shared IPs across brands — with no way to isolate reputation damage - Suppression rules that silence the wrong messages - ESP dashboards that stop at “delivered” - One-size-fits-all routing logic that doesn’t reflect business priorities - Delayed signals that surface only after customers complain And when something breaks — or engagement drops — they go hunting for a content issue. Or worse, assume it's just Microsoft being Microsoft. ¯\_(ツ)_/¯ In reality though, it's usually not the message. It’s the infrastructure beneath the message. So, here's a quick gut check. If you're seeing dips, blocks, or weird patterns, ask yourself: ✅ Do we have brand-level visibility? ✅ Are we separating transactional from promotional traffic by IP or domain? ✅ Can we track suppression behavior across senders — not just campaigns? ✅ Is our ESP giving us enough to actually diagnose issues, or just… reporting symptoms? ✅ Have we reviewed our subaccount configuration and domain delegation recently? If you can’t confidently say “yes” to most of those… the issue might not be your content or cadence. It might be the invisible plumbing you’re relying on... and now it's gettin' backed up. I pulled these questions into a quick self-check graphic below. Share it with your product, infra, or lifecycle teams. I promise, at least one of them has felt this pain before. This is your chance to be their migraine relief. 💌

We've audited over $50M in DTC revenue this year. ↳ Almost every brand had emails going straight to spam. (+ none of them knew it was happening) These weren't small brands. They were 7 and 8-figure companies silently losing $10K-30K monthly. Why? Because 30-40% of their emails never reached the inbox. The worst part?  Their ESP dashboards showed "delivered" stats of 98%+. Here's what we consistently uncover: 1. Misconfigured sending infrastructure → Unverified SPF/DKIM records → Unverified branded sending domain (still?!) 2. Toxic engagement ratios → Consistently sending to unengaged contacts → Even your best customers stop seeing your emails. 3. Hidden spam traps → Lack of exclusion segmentation hurting placement → Not filtering out signups from certain APIs     (TikTok shop emails I’m looking at you) → Each send to fake contacts severely damages reputation 4. Send frequency blindness → Sending daily "because competitors do"    (without the engagement metrics to support it) → Find your audience's sweet spot 5. Zero list hygiene protocol → Keeping subs who joined 365+ days ago + never purchased → Keeping unengaged bloat in hope that one day they purchase    (they won’t…) This isn't theoretical. We're seeing spam placement rates as high as 60%. Fix your deliverability: More emails in inbox ↓ More eyes on your offers ↓ More clicks on your CTAs ↓ More earning potential 

Look, we need to talk about your email deliverability problems. They're probably not your fault... but they probably are. I've spent the past three weeks drowning in client deliverability disasters, and trust me, their problems aren't outliers. Everyone is struggling right now and it's bad. Here's the hard truth: ESPs aren't messing around anymore because they know the mailbox providers (MBPs) aren't messing around. It's a chain of panic, and you, my friend, are at the bottom of it. Let's break this down like (responsible) adults: ESPs have a limited number of shared IPs at each level, and they're guarding them like dragons guard their gold. They're desperately trying to stay compliant with MBPs, so they're being cautious about deliverability metrics (that's why Klaviyo added that deliverability tab with their own KPI goals for their users). And guess what? ESPs will protect THEIR reputation FIRST. Your marketing goals? Yeah, those come last. They'll throw you under the bus in a heartbeat if you're hurting their sender score, whether you meant to or not. So what does this mean for you as sender? 🛑 Monitor your traffic sources, for the love of all email – Where are these subscribers coming from? Did they ACTUALLY consent to your emails, or are you just collecting addresses like Pokemon? Not all traffic is good traffic. Tag it, qualify it, clean it. 🛑 Stop hoarding dead subscribers – Seriously, take Elisa's advice and let it go. They're not coming back. 🛑 Segment with actual intention – Not everyone needs EVERY. SINGLE. CAMPAIGN. Send relevant content to people who might actually care. 🛑 Watch your bounces and spam complaints – These are flashing neon signs saying "Steep Cliff Ahead, Turn Right!" Why are you ignoring them? 🛑 Gmail doesn't have feedback loops to your ESP – Start using Google Postmaster or remain clueless. Your choice. If everything in your account looks spotless but you're still having issues, congrats! You might have terrible neighbors on your shared IP. Reach out to your ESP and ask why they moved you to the email equivalent of the bad part of town. They've got the receipts. Here's how to tell what's happening: ↳If YOU'RE the problem child, ESPs will quietly move you to a new (crappier) pool. ↳If your IP NEIGHBORS are the troublemakers, you'll watch your reputation tank without necessarily changing IPs. Questions? Drop them in the comments. Or if you need someone to rescue your deliverability (again), my DMs are open.

I've managed email for 20+ eight-figure brands over the last 5 years. The single biggest revenue killer I see in every audit is deliverability. I had a client come to me after growing their list from 50K to 100K subscribers in 6 months. Their email revenue had dropped 30% during that same period. The list got bigger and the money got smaller. They were blasting every campaign to the entire list, including subscribers who hadn't opened a single email in over a year. ESPs track how your subscribers engage with your emails. When engagement tanks across your list, they quietly stop putting your emails in the primary inbox. Your best customers stop seeing your campaigns because your worst subscribers are dragging down your sender reputation. The system I use to fix this is called Engagement-First Sending: 1. Hot segment (engaged in the last 30 days) gets every campaign. 2. Warm segment (31-60 days) gets about 70% of campaigns. 3. Cool segment (61-90 days) gets biggest promotions only. 4. Cold segment (90+ days) enters a re-engagement sequence and gets removed if they don't respond. It sounds backwards, but sending to 30K engaged subscribers generates more revenue than blasting 80K mixed. ISPs reward consistency, and that reputation boost hits every email you send going forward. For a lot of these brands, fixing deliverability alone increased revenue 20-30% without changing a single product or touching ad spend. Open rates tend to improve within 2-3 weeks. Full revenue impact usually shows up around 60 days. Deliverability is the highest ROI fix in email marketing because it multiplies everything else you do after it.

“Delivered.” That single word has killed more email revenue than bad copy ever will. I’ve had founders send me screenshots saying, “Everything looks fine. 99.4% delivered.” And then in the next message: “Why did revenue drop 27%?” Here’s the hard truth most teams learn too late: 1. Delivered doesn’t mean inbox. 2. It means accepted by the server. 3. That email can still land in spam. Or promotions. Or never be surfaced at all. A few months ago, I worked with a SaaS team convinced their new onboarding sequence was broken. They rewrote subject lines. Redesigned templates. Blamed creative. The real issue? Their inbox placement dropped because a DNS update knocked DKIM out of alignment, and their unsubscribe flow created enough friction that spam complaints started creeping up. Gmail quietly started filtering more aggressively. Nothing looked wrong in their ESP dashboard until its late. But inbox placement told a different story. This is the silent leak in email marketing right now. Especially going into 2026, where mailbox providers are stricter, engagement signals matter more, and bulk-sender expectations are no longer optional. If your opens or revenue dip while “delivery” stays stable, here’s what to check before rewriting a single word: 1. Verify SPF, DKIM, and DMARC alignment. Small DNS changes can break trust. 2. Audit your unsubscribe experience. Friction increases complaints, and complaints kill inboxing. 3. Look at engagement by mailbox provider. A Gmail-only drop is a major clue. 4. Run an inbox placement test before your next major campaign. 5. Email isn’t just about writing anymore. It’s about maintaining trust infrastructure. The teams winning right now treat deliverability like a daily/weekly operational routine, not a once-a-year panic project. Quick question: When your performance drops, do you check placement first… or rewrite the subject line? #email #emailmarketing Resolute Mailora, LLC

Most of the damage to your email deliverability isn’t mysterious or advanced or caused by some evil spam wizard. It’s the SAME 4 MISTAKES. Repeated. And you CAN see them in your charts and data: 1. Dirty data is the problem What the charts look like: A sharp rise in hard bounces at the start of a send, often tied to specific lists or campaigns. Hard bounces are one of the clearest signals inbox providers use to judge sender quality. Enough of them, and reputation damage happens fast. 👉Btw, at SendPost (a sending engine for ESPs), they treat hygiene as infrastructure, not an add-on. Address validation and list cleanup are built into the sending flow, so bad data gets caught before it damages your reputation, not after support tickets start piling up. 2. Broken authentication What the data says: Hard bounces look normal. Nothing is on fire. But soft bounces start inching up, and opens and clicks slowly slide down. It just… sags. That shape almost always points to authentication issues. SPF, DKIM, or DMARC are missing, misaligned, or expired. 👉How to solve it: Check your authentication regularly. Don't assume it to be permanent. If something breaks — a DNS change, a domain update — it should be corrected before reputation takes a hit. 3. Bad Email Construction What you'll see: Open rates stall. Clicks barely move. Soft bounces tick up even though your list hasn’t changed. The email technically sends, but inbox providers treat it like it showed up carrying too much luggage and several broken links. 👉The solution is: Lossless compression, clean code, alt text to your images, and proper links to legit websites. It's all part of the tool if you use SendPost. 4. Traffic Spikes that are a Reputation Tax This chart is impossible to miss. It's the chart of your sending. If it looks like this…. Flatline. Flatline. Then one enormous spike. Then silence again. Then three huge spikes in a row because campaigns piled up and something had to go out. Inbox providers reward consistency. Sudden spikes look risky, even when everything else is done right. So the real question is: ❓ How do you actually see all of this? You shouldn’t have to ask support for exports, stitch together CSVs, or wait until Gmail starts pushing back to understand what’s happening. This data should be visible upfront, in charts that make problems obvious while there’s still time to fix them. If your provider can’t give you that level of visibility, you’re taking on more risk than you probably realize.

After analyzing 1000s of failed cold email campaigns, here are the biggest deliverability killers I see: 1️⃣ Technical mistakes: → Sending from brand new domains (instant red flag) → Skipping warm-up (like running a marathon with zero training) → No SPF/DKIM/DMARC authentication (you're basically unverified) 2️⃣ Content red flags: → "ACT NOW!" language (screams spam to filters) → Misleading subject lines (destroys trust permanently) → Copy-paste templates (recipients and filters spot these instantly) 3️⃣ List problems: → Bought email lists from cheap sources (full of spam traps and complainers) → Mass blasting irrelevant people (spray and pray = deliverability death) 4️⃣ Volume issues: → Sending huge batches at once (mimics spammer behavior) → No gradual ramp-up (sudden spikes trigger automatic filtering) 5️⃣ The sneaky ones: → HTML-heavy emails (plain text performs better) → Aggressive formatting (ALL CAPS, excessive !!!, emoji overload) 6️⃣ The one that kills domains: → Not monitoring spam complaints. Once recipients start hitting "spam" instead of unsubscribe, you're toast. (email providers remember this forever) The fix? ☑ Personalize every email ☑ Keep it simple and text-based ☑ Authenticate your domain properly ☑ Monitor your sender reputation religiously ☑ Warm up gradually (we recommend 30+ days) Smart senders focus on one thing first: making sure their emails land in the inbox. What's your biggest deliverability struggle now?

Microsoft Cold Email Deliverability is brutal. Here's what actually works in 2025 Most cold email guides focus on Gmail deliverability, but Microsoft Outlook/Exchange is where campaigns die. After managing thousands of cold email domains, here's what we've learned about Microsoft's unique challenges: Why Microsoft is Different from Google: → Zero tolerance policy - Google gives warnings, Microsoft sends straight to spam →New domain penalties - Fresh domains without perfect setup get flagged immediately →Internal spam scoring - Microsoft uses a 0-10 internal score that's more aggressive than Google's →Warm-up blindspot - Most tools only warm up Gmail, leaving Outlook cold What Kills Your Microsoft Deliverability: → Generic copy patterns - Their AI detects template-based content faster → Insufficient randomization - Basic spintax isn't enough anymore → Wrong infrastructure - Using consumer-grade SMTP for business emails → Poor DNS setup - Missing or incorrect SPF/DKIM/DMARC records We at GrowthBand manage 15k+ mailboxes for our clients, and that's what works consistently Infrastructure: → Microsoft 365 setup (DNS shield on Cloudflare) + Azure SMTP with enterprise-level IP reputation (Best option, 1 domain = 10 mailboxes = 50 cold emails / day) → Separate warm-up pools for Microsoft vs Google (don't warm up your infra for MS deliverability on Google pools, use premium warm-up solutions) Technical Requirements: → Perfect DNS authentication (SPF, DKIM, DMARC) → Microsoft-specific inbox placement testing (super important!) → Content randomization beyond basic spintax → ESP matching (send Microsoft-to-Microsoft and Azure SMTP to MS, no Google to MS when possible) Testing Protocol: → Weekly inbox placement tests including Outlook → Separate deliverability monitoring for each ESP → Domain rotation system for when issues occur The Hard Truth: This setup costs 2-3x more than basic cold email infrastructure. But burning domains and killing campaigns costs way more. Common Mistakes That Guarantee Spam: → Using shared SMTP services → Only testing deliverability on Gmail → Sending identical content across domains → Ignoring Microsoft-specific warm-up requirements Key Metrics to Track: → Inbox rate specifically for Outlook/Exchange domains → Microsoft spam score trends → Domain reputation across both Google and Microsoft networks Most agencies and in-house teams miss this because Microsoft deliverability requires specialized knowledge. The result? Burned budgets, destroyed domain reputations, and teams blaming "cold email being dead." Important: If you have a lot of Mimecast and Proofpoint (Advanced SPAM shield on top of Outlook) in your recipient's lists, prioritize Azure SMTP with Enterprise IP for mailbox creation. Comment MS cold email - I'll DM you a detailed checklist.