This one is a post I would rather not write, which is usually a sign it is useful.
I set up a batch of new Google Workspace inboxes for cold email, connected them to sending tools, and within a few days every sending inbox on that setup had been suspended. I had to pause all the campaigns that depended on them.
Here is my honest read of what went wrong. I do not have a statement from Google, so treat this as my best explanation, not a diagnosis.
What I did
Roughly this, in a short window:
- Created a block of new accounts on a discounted Workspace setup
- Set up the domains and authentication
- Connected the new inboxes to sending tools one after another
- Started warmup at the same time
Along the way, Google kept asking the new accounts for phone verification. I did not have enough numbers for all of them, and I kept pushing through the prompts.
What I think triggered it
To an automated system, that pattern looks like abuse:
- Many brand-new accounts created together. Real companies do not onboard a dozen mailboxes in an afternoon.
- Connected to automation almost immediately. A new account that starts authorising sending tools on day one is unusual.
- Repeated phone verification prompts. That is a signal in itself that the account is under suspicion.
- A discounted setup. I would not read too much into any one thing, but cheaper tiers can come with tighter scrutiny, and I had less of a track record to lean on.
What I would do now
If I were rebuilding, this is the order I would follow:
- Use fewer inboxes to start. Three or four, not a dozen.
- Sign in manually first. Log in to each inbox like a person, read the welcome mail, send a couple of real emails.
- Wait a few days before connecting anything to a sending tool.
- Connect two or three at a time, not the whole fleet.
- Start warmup slowly. A few emails a day, not the maximum.
- Keep each domain to a small number of inboxes so a problem on one does not take out everything. I covered the ratios in how many inboxes do you need.
- Think about whether a managed inbox provider fits better. For some setups it is cheaper than the time lost to a suspension.
What I would not do
- Push through phone verification prompts repeatedly
- Recreate the same setup at the same speed and expect a different result
- Run live campaigns from accounts that have not settled
- Treat a suspension as a one-off. It is information about how the setup looks
The cost nobody counts
A suspension is not just a few lost inboxes. It pauses campaigns, wastes the warmup time you already spent, and delays results by weeks. The two or three days it feels like you save by connecting everything at once cost you far more.
If your emails are landing in spam rather than being suspended, that is a different problem and the order to check things in is where I would start. And if you want an outside look at the setup before you send, what an email deliverability audit covers is the checklist.
The short version
Slow beats fast with new inboxes. Fewer at a time, signed in by hand, warmed gently, and kept away from live campaigns until they have settled. The extra week it takes up front is cheaper than rebuilding.