🔒 Personal
Only you
A private thought attached to the thread.
"Remember to call Sarah tomorrow."
PlainMailOS · Email, operated
Your inbox should
tell you what matters.
PlainMailOS turns email into an intelligent workspace that knows what needs attention, what can wait, who needs to act, and what happens next.
For individuals and teams·Gmail · Outlook · IMAP · Custom Domains
Inbox
Starred
Sent
Drafts
Sticky Notes
Alerts
Good morning, Kalpesh
4 things need your attention.
Customer waitingSarah is waiting for your reply.
Sarah Johnson
Re: Order #4821 — "Just checking if..."
Rahul Mehta
Contract approval
📝 New sticky note
Rahul mentioned you
"Can we approve this?"
Open thread →
The problem
Email isn't the problem.
Everything around it is.
Your inbox contains customers, clients, managers, employees, invoices, contracts, questions, deadlines, approvals, follow-ups, notifications, opportunities — and hundreds of conversations that don't need you right now.
Yet most email applications reduce all of it to three states.
What email gives you
Read · Unread · Starred
≠
What PlainMailOS understands
Received vs. needed
The shift
Stop checking your inbox.
Start knowing your inbox.
What needs my attention?
Who is waiting for me?
What have I forgotten?
What's becoming urgent?
What can safely wait?
What should happen next?
Instead of opening your inbox and figuring it out — PlainMailOS brings the important things to you.
The intelligence engine
A deterministic engine
behind every inbox.
PlainMailOS doesn't rely on a model to make every decision. Its core intelligence is deterministic — structured rules that identify patterns, states, relationships and potential actions with the same result every time.
Unanswered emailsFollow-up opportunitiesResponse delaysEscalationsDeadlinesApprovalsSender importanceConversation stateOverdue follow-upsPriority changes
Rules
Provide consistency. The same pattern is caught the same way, every time, and every result traces back to a named rule.
AI
Provides context. When a situation is ambiguous, AI interprets what the deterministic engine can't easily resolve — never the reverse.
How it fits
Your inbox gets
an intelligence layer.
PlainMailOS sits above the email you already use. You don't replace your provider — you make it more intelligent.
GmailOutlookIMAPCustom Domain
↓
Deterministic Engine
+
AI Intelligence
+
Alert Engine
+
Sticky Notes Collaboration
↓
You + your team
Smart alerts
Not every email
deserves your attention.
Needs attention
Sarah has been waiting for your response for 6 hours.
Follow up
Rahul hasn't responded to the proposal you sent three days ago.
Escalation
This customer has sent three messages without resolution.
Important
Your contract renewal deadline is tomorrow.
Resolved
This conversation appears to be complete.
Alerts 4
Reply required
Sarah Johnson
Waiting 6 hours
Follow-up
Rahul Mehta
Waiting 3 days
Escalation
Customer #4821
3 messages, unresolved
Deadline
Contract expires tomorrow
Follow-ups
Never lose a conversation
because you forgot.
You send "I'll get back to you tomorrow." Tomorrow comes, then Friday, then next week — and the email disappears under two hundred others. PlainMailOS identifies conversations that appear to be waiting on you.
You send proposal→No response→2 days→🟠 Follow up?
Follow upSnoozeDismissResolve
The defining feature
Ask your team without
forwarding the email.
CUSTOMER · Sarah Johnson
"Can I get a refund?"
📝 Internal — customer never sees this
Amit → @Rahul
Can we approve this refund?
Rahul → Amit
Yes, up to ₹5,000.
Amit
Done.
You're reading a customer email and need to ask your manager something.
Forward → CC manager → explain context → wait → search for it later
📝 Add a sticky note → @mention → done
No forwarding. No unnecessary CC. No separate Slack message. No losing the context. The note stays attached to the exact thread it belongs to, forever.
@mentionReply trailResolveNotify
Note states
Instead of "did you see my message?" — you see exactly where it stands.
NewReadAcknowledgedRepliedResolved
Not everything is for everyone
👤 Mentioned
Selected people
Visible only to whoever's tagged in.
"@Rahul can you check this?"
👥 Team
The right team
Visible to the relevant department.
"Support team — anyone handled this?"
📬 Mailbox
Shared access
Visible to authorized mailbox users.
support@yourcompany.com
Built for both
Your personal inbox.
Your company's inbox.
For individuals
One person, multiple inboxes, one intelligent workspace — personal Gmail, work Gmail, Outlook, IMAP, custom domains, all together.
- What needs a reply
- What needs a follow-up
- What can wait
- What's important
- What you've missed
For companies
Companies have departments, shared mailboxes, escalations and hundreds of internal decisions happening around external email. PlainMailOS gives them a structured layer above it.
Company
├── Sales — Rahul, Priya, Amit
├── Support — Sarah, John
└── Finance — Neha, Raj
Shared: support@ · sales@ · billing@
Private email stays private. Shared email stays shared. Access follows permissions, not assumptions.
Security & privacy
Your inbox is not your
company's noticeboard.
PlainMailOS treats mailbox access as a permissioned resource — sensitive infrastructure, not just another database record.
Individuals
Your private mailbox stays yours — always.
Companies
Employees don't automatically gain access to one another's private email.
Shared mailboxes
Explicitly shared, never implicitly open.
Sticky Notes
Defined visibility — enforced by the backend, never hidden by the frontend.
Administration
Company policies determine exactly what each role can see and do.
The difference
Your old inbox
vs. PlainMailOS.
| Traditional email | PlainMailOS |
|---|---|
| Unread count | What needs attention |
| Search messages | Search work |
| Star email | Intelligent priority |
| Forward email | Sticky Note |
| CC someone | @mention |
| Remember follow-ups yourself | Follow-up detection |
| Read the entire thread | Conversation intelligence |
| Check inbox constantly | Alerts come to you |
| AI as a separate tool | AI inside the workflow |
| Email is the workspace | Email becomes an action system |
Pricing
Priced per person,
not per mailbox.
Personal
$12/mo
For individuals.
- 1 user
- Multiple email accounts
- Gmail / Outlook / IMAP
- Custom domains
- Smart alerts
- Follow-up detection
- Sticky Notes
- Advanced search
Most teams
Professional
$25/user/mo
For professionals and small teams.
- Everything in Personal, plus
- Team collaboration
- Shared mailboxes
- Team Sticky Notes
- Team alerts
- Advanced permissions
- Manager insights
Business
$40/user/mo
For growing companies.
- Everything in Professional, plus
- Company policies
- Department controls
- Advanced automation
- Audit history
- Org-wide intelligence
Enterprise
Custom
For organizations requiring more.
- SSO & identity management
- Custom retention policies
- Dedicated support
- Custom integrations
- Advanced governance
A seat represents a human, not an email address. One employee might connect their personal Gmail, work Gmail and a shared sales mailbox — that's still one seat, not three.
Questions
Frequently asked.
Does PlainMailOS replace Gmail or Outlook?+
No. PlainMailOS works with the email accounts you already use — nothing to migrate.
Can I connect multiple email addresses?+
Yes, subject to the limits of your plan.
Can I connect an IMAP account or my own domain?+
Yes to both — compatible IMAP accounts and custom-domain mailboxes are supported.
Can employees see each other's email?+
Not automatically. Private and shared mailboxes are treated differently, and access follows your company's configured permissions.
Can Sticky Notes be seen by customers?+
No. Sticky Notes are internal to PlainMailOS and never leave the platform.
Does PlainMailOS use AI?+
Yes — as one part of the intelligence system. Deterministic rules handle predictable decisions; AI helps with context and ambiguity where it's genuinely useful.
Does AI automatically send emails on my behalf?+
Not by default. Actions that affect your mailbox stay under your control and permissions.
What happens when an employee leaves the company?+
An administrator can revoke their access according to your organization's account and mailbox policies.
Ready when you are
Email is where work happens.
Make it work for you.
PlainMailOS turns your inbox into an intelligent workspace for thinking, deciding and getting things done — for yourself, your team, your company.
Connect your existing email · Gmail · Outlook · IMAP · Custom Domains