Meet https://xitter.cf/t.co/Z7Zm5O9O0a - Your modern AI SDR aka lead discovery and email outreach tool. Get Started for free here 👇
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Joined April 2022
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Meet Firstsales.io
The only AI SDR you would need to fill your empty calendar with hot prospects.
FirstSales.io | AI SDR retweeted
Wow! I'm stunned.
Opus 5.5 made this launch video...
.. in 40 minutes and costed $20.62
I'm just blown away.
Prompt below 👇
THE 2026 OUTBOUND STACK
13 days of problems. here's the system that answers all of them.
not more tools. one connected loop. save this.
the old stack was a list and a send button.
it worked when inboxes were empty and reply rates were 8.5%.
at 3.43% in a saturated, filtered, fatigued inbox, the list-and-blast model is dead. you need a loop.
how founders sell in 2026 without hiring a single SDR:
they don't out-hustle a sales team.
they run a system that does the BDR grind, and they keep the one part that doesn't scale: being the founder.
this is exactly who FirstSales is for:
point it at your ICP, it runs the outbound machine, you show up as the founder for the conversations that open.
leverage without headcount.
mistake 6: no DMARC enforcement.
p=none forever means you're monitoring but never protecting.
and post-2025, missing DMARC entirely gets you rejected at Gmail outright.
the through-line:
deliverability isn't one setting. it's a system - domains, warmup, inbox rotation, hygiene, auth, monitoring - working together.
skip one and the whole thing leaks.
mistake 4: "delivered" ≠ "inboxed."
your tool says delivered. that just means it wasn't bounced.
it can be "delivered" straight into spam. you need placement tracking, not delivery receipts.
mistake 3: overloading one inbox.
50+ cold sends/day per mailbox is a red flag to filters.
spread volume across multiple inboxes/domains. low and slow per box.