When a Google account hits 100 percent of its storage, Gmail stops working in both directions. You can't send, and mail sent to you goes back to the sender. For anyone doing outreach that second part is the costly one: a prospect who replies gets a bounce, and from their side your address looks dead. The fix usually takes about 15 minutes, with five Gmail search strings, and a two-minute monthly check keeps it from happening again. Here is the order to work in.
What happens at 100 percent
Google's help page says it plainly: when storage is full, you can't send or receive emails, and messages sent to you go back to the sender. The storage is shared. The 15 GB on a free account is counted across Gmail, Drive and Photos together, so a full Drive can stop your email without a single large message in your inbox.
The sender sees a bounce, usually worded like "the email account that you tried to reach is over quota." Someone who just answered your cold email gets that message and has no idea it's a storage problem. Many won't try again. Your own sends fail too, often with a plain error and no obvious reason. If you're not sure that's what's going on, emails not sending from Gmail has the full checklist, and email bounced back explains the bounce messages.
The 15-minute cleanup, in order
Lu runs a mobile pet-grooming business and uses one Google account for everything. She's at 15.0 GB of 15 GB: Gmail 7.1, Drive 5.4, Photos 2.5. Here is what she does, with the minutes.
- See what is using the space (1 minute). Open your Google storage page and read the three numbers.
- Delete big attachments (4 minutes). In the Gmail search box, type has:attachment larger:10M, select all, and look before deleting. For smaller but still heavy files try larger:5M. Lu clears 2.8 GB.
- Delete old promotions (3 minutes). Search category:promotions older_than:1y. Those are newsletters and offers nobody will read again. She clears 0.9 GB. For old messages with attachments, older_than:2y has:attachment is the next stop.
- Empty spam and trash (1 minute). Search in:spam and in:trash and delete forever. Google notes these folders count against your storage until they're permanently deleted. Gmail empties them on its own after about 30 days, but you can do it now. That's 0.4 GB.
- Check Drive and Photos (4 minutes). Drive's storage view lets you sort files by size, largest first. Lu finds a 1.2 GB phone video backup in Photos and removes it.
- Confirm and send a test (2 minutes). Refresh the storage bar and send yourself a message from a second address.
Total freed: 2.8 + 0.9 + 0.4 + 1.2 = 5.3 GB. She's now at 9.7 of 15 GB, which is 65 percent. Fifteen minutes, and her address works again. Deleting can take a little while to show up in the storage count, so if the bar hasn't moved after a few minutes, reload it.
Two cautions. Before you delete attachments in bulk, search for ones you may need for taxes, contracts or insurance, and save those somewhere else first. And if the account is shared by a team, tell them what you're clearing.
When to buy storage instead
Deleting is free but it takes judgment. Buying storage is a few dollars a month (check Google's current price) and saves the judgment. Buy when you're still above about 80 percent after a cleanup, when the old mail is a record you need to keep, or when the account carries a business and an hour of your time is worth more than a year of storage. Workspace plans include a storage amount per user that depends on the plan, so check yours before paying for extra. If you're thinking about which kind of account to run outreach from, Google Workspace vs Gmail covers the difference.
A monthly two-minute check
Put a repeating reminder on the first of each month. Look at the storage bar. Under 80 percent, close it. Over 80 percent, run steps 2 to 4 above. At 15 GB, 80 percent is 12 GB, and that leaves 3 GB of room, a few weeks of normal mail with attachments. This check keeps a silent failure from starting.
Reaching the people who got a bounce
Once the account works, look back through the days it was full. Check your sent log for follow-ups that failed, and think about who was waiting on you. If you know someone tried to reply, a short note from a second address or a phone call fixes it:
Hi Marcus, my inbox was full for a few days and I think a reply from you bounced. It is fixed now. If you wrote back, please send it again, or call me on (555) 010-0142. Sorry for the trouble.
Do not blame the person or make a big deal of it. One plain sentence is enough, and most people are glad you checked.
Why it matters if you send outreach
Outreach depends on replies arriving. A full account loses them without telling you, so you can lose a customer and never know. It also affects your sending volume: an account that stops sending mid-batch leaves half a sequence unsent. Related reading: Gmail daily user sending limit exceeded covers the other common sending stop, and how many cold emails per day from Gmail covers pacing. If a Gmail address is now your main inbox, Gmail vs Outlook compares the limits of the two, and Gmail read receipts covers how to tell whether a message was seen.
Rocketship finds the buyers, emails them from your own Gmail, follows up, and books the meeting on its own. Plans that get you customers start at $24.99 a month (Launch), and both Launch and Frontier start with a 7-day free trial, card required. Keep your storage under control and the replies keep arriving. See the AI workers.