When you set up professional email for your company, one of the first questions you face is how big each mailbox should be. Hosting plans offer anything from 1 GB to 50 GB or more per account, and it is hard to know what is right. So, how much storage does a business email account need? The answer depends on the person using it, what they send and receive, and how long you keep old mail. This guide helps you estimate sensible sizes for your team in Uganda without overpaying.
What actually fills up an email mailbox?
Plain text emails are tiny. You could store thousands of them in a few megabytes. The real space users are:
- Attachments: PDFs, scanned documents, Word and Excel files, and especially photos and videos.
- Images inside emails: newsletters and email signatures with large logos.
- Sent items: every attachment you send is stored again in your Sent folder.
- Trash and spam: deleted mail often stays until the folder is emptied.
- Years of history: a mailbox that is never cleaned grows steadily.
A single scanned contract can be 2 MB to 5 MB. A set of phone photos from a site visit can easily reach 20 MB. Multiply that by months of work and you can see why some mailboxes fill up quickly.
How much storage does a business email account need by role?
These are practical starting points based on typical usage patterns. Your team may differ, so treat them as a guide, not a rule.
Light users: 1 GB to 2 GB
Staff who mostly send short messages, receive occasional documents and rarely attach large files. Examples include a receptionist, a security supervisor or a shared address like info@ that forwards enquiries to others.
Regular office users: 5 GB
Most administrative, sales and customer service staff fit here. They exchange quotations, invoices and reports every day but do not usually handle large media. For a typical SME in Kampala, 5 GB per person is a comfortable default.
Heavy users: 10 GB to 25 GB
Directors, accountants, procurement officers and project managers often receive large attachments, keep long email threads and need years of history for audits or disputes. Give them more space so they do not waste time deleting mail.
Media heavy users: 25 GB and above
Architects, engineers, marketing teams, photographers and designers who send drawings, high resolution images and artwork. Even so, very large files are better shared through a cloud storage link than attached directly.
A simple way to estimate your own needs
If you already have email, the best evidence is your current usage. Follow these steps:
- Check the current size of each mailbox in your email client, webmail or hosting control panel.
- Note how long each account has been in use.
- Divide size by years to get a rough growth rate per year.
- Multiply that growth rate by the number of years you want to keep mail, then add a buffer of about 30 percent.
Example: your accountant's mailbox is 3 GB after two years. That is roughly 1.5 GB a year. If you want to keep five years of mail, that is about 7.5 GB, and with a buffer around 10 GB. Give that account 10 GB and review it yearly.
If you are starting fresh, begin with 5 GB for most users, more for a few heavy users, and monitor usage after six months.
What happens when a mailbox is full?
When an account hits its limit, new incoming emails may bounce back to the sender with a "mailbox full" error. For a business, that can mean a missed tender, a lost booking or a frustrated client who thinks you ignored them. Staff may also be unable to send mail until they free up space. This is why it is worth setting mailbox sizes with room to grow and turning on warnings before an account gets full.
Ways to keep mailboxes under control
Bigger mailboxes are not the only answer. Good habits keep storage needs reasonable:
- Empty Trash and Spam regularly, or set them to clear automatically after 30 days.
- Use cloud links for big files. Share large documents through Google Drive, OneDrive or similar instead of attaching them.
- Archive old mail. Export older years to an archive file stored safely and backed up.
- Clean up the Sent folder. Search for large sent items and remove those you no longer need.
- Compress images. Phone photos can be resized before sending.
- Keep signatures light. Use a small logo image rather than a heavy banner.
Other factors that matter as much as storage
Storage is just one part of choosing business email. Before you decide on a plan, also consider:
- Attachment size limits: many servers limit attachments to around 25 MB per email.
- Spam and virus filtering: good filtering keeps junk out and protects staff.
- Security: support for strong passwords, encrypted connections and proper SPF, DKIM and DMARC records.
- Backups: whether your provider backs up mail, and how you can restore it.
- Access: webmail plus support for phones and apps like Outlook and Gmail.
- Local support: someone who can help when a staff member cannot send email on a Monday morning.
Baasa Cloud business email plans let you set mailbox sizes per user, include spam filtering and run on servers with daily backups, and our local team helps you configure email on phones and laptops.
Shared mailboxes and aliases
Not every address needs to be a full mailbox. An alias such as sales@ or careers@ can simply forward to one or more real mailboxes, using no storage of its own. Use full mailboxes for real people and aliases for departments and functions where possible. This can reduce cost and keep your setup tidy.
Frequently asked questions
Is 1 GB enough for business email?
For a light user it can be, at least for a while. For most office staff, 1 GB fills up within a year or two, so 5 GB is a safer starting point.
Can I increase mailbox size later?
Usually yes. Most hosting control panels let you raise a mailbox quota at any time, as long as your plan has enough total storage.
Does IMAP use more storage than POP?
With IMAP, mail stays on the server so it can sync to all your devices, which uses server storage. POP downloads mail to one device and often removes it from the server. IMAP is better for most businesses because mail is accessible everywhere.
Should I keep emails forever?
Keep what your business and legal obligations require, such as records related to tax and contracts, and archive the rest. Ask your accountant or lawyer how long you should retain key records.
Conclusion
There is no single right answer to how much storage a business email account needs, but there is a sensible process. Give light users 1 GB to 2 GB, most staff around 5 GB and heavy users 10 GB or more, then review usage regularly. Combine the right sizes with good habits like cloud sharing and archiving, and your team will rarely see a "mailbox full" message. If you need professional email on your own domain, the Baasa Cloud team can help you choose the right plan.