A separate email address for every client or project
Create one nicemails mailbox for each client or project. Every mailbox is real and independent, not an alias: it has its own address, inbox, folders, sender name and storage. You manage them all from one account, and read new mail from every mailbox together in All inboxes or one mailbox at a time.
Why give each client a separate email address?
When every client writes to one address, their mail mixes together. Verification codes, application updates and invoices for different people land in the same list, and it is easy to reply under the wrong identity or miss a message.
A separate address per client keeps each relationship in its own inbox. The mailbox a message arrived in tells you who it is about. You can hand one mailbox to an agent or a script without exposing the rest, and when the work ends you can close that mailbox without affecting the others.
Is a nicemails mailbox just an alias?
No. An alias is another name for an inbox you already have. A nicemails mailbox is an inbox of its own: mail sent to its address is stored in that mailbox, with its own folders and storage, and mail you send from it comes from its address and sender name.
Each mailbox includes:
An address on the shared nicemails domain, with a name you choose.
Its own Inbox, Sent, Archive, Spam and Trash folders, plus folders you create.
A sender name that recipients see in the From field of the mail you send.
A private note and an optional link, for example to the client’s project page, for your own reference.
Its own storage: up to 9 GB per mailbox, within your account’s shared storage.
Its own sending limit of 50 recipients per UTC day.
Plus addressing works too: mail sent to name+anything@ arrives in the name@ mailbox.
How do I set up a mailbox for a new client?
Sign in to nicemails, or create a free account with your email address. You sign in with a code; there is no password.
Select New mailbox and choose an address name, such as the client’s or the project’s name. nicemails checks that the address is available before you create it.
Add a sender name so recipients see who is writing. You can also add a private note and a link.
Give the address to your client, or use it for that client’s sign-ups, applications and correspondence.
Read and reply in the web app. Replies go out from the client’s mailbox, under its address and sender name.
How do I keep many client mailboxes organized?
All inboxes shows the Inbox of every mailbox in one list. Switch to a single mailbox to see only that client’s mail.
Sort the mailbox list by creation order, latest mail or name, or show only mailboxes with unread mail.
Give a script or an AI agent access to one client’s mailbox only: API keys and MCP connections can be limited to a single mailbox.
Pause a client by disabling the mailbox. New mail is rejected and sending stops, but existing messages stay, and you can enable it again.
Delete a mailbox when the work is over. Its address is retired permanently and is never given to anyone else, including you.
Through the REST API or MCP, you can also search up to 20 mailboxes at once.
How many client mailboxes can I have?
Free: 3 mailboxes and 3 GB of storage, sending to 50 recipients a month from the web app or through MCP.
Pro, $10 a month: 100 mailboxes, 10 GB of storage and 3,000 recipients a month, including sending through the REST API.
Receiving is unlimited on both plans, within your storage. Free accounts can create up to 3 mailboxes per UTC month, and any account up to 20 per UTC day. Compare plans for every limit.
Common questions
Is each client mailbox a real mailbox or an alias?
A real mailbox. Mail sent to it is stored in that mailbox, with its own folders and storage, and mail you send from it comes from its own address.
Can I use my own domain?
No. Mailboxes use the shared nicemails domain; custom domains are not supported.
Can a client sign in to their own mailbox?
No. All mailboxes belong to your account and you manage them. nicemails has no separate sign-in for a single mailbox.
Can I use Outlook, Apple Mail or another email app?
No. nicemails has no IMAP or SMTP access. Use the web app, the REST API or MCP.
What happens to the address when a project ends?
Disable the mailbox to reject new mail and keep its messages, or delete it. A deleted address is retired permanently and can never be used again, even by you.