Send from your own
mailbox and number.
Email and WhatsApp in one request, free, to your contacts. You connect your own mailbox and your own WhatsApp number: recipients see the address and the number they already know, replies come back to you, and your sender reputation never depends on anyone else.
The context
Who is actually sending your messages?
Mailbox providers judge a message largely by who sends it: Google's sender guidelines tie deliverability to the sending domain, its authentication and its reputation.
Many sending services hand you an address on their own shared domain, or a number shared with other customers. It is quick to start, but the identity your customers see is not yours, and the reputation of that sender is pooled with everyone else using it.
UnlimitedMessaging takes the opposite approach. It is a transport, not a sender: you connect your own mailbox over IMAP/SMTP and link your own WhatsApp number by scanning a QR code. Emails leave from your address, through your own mail server, and messages leave from your number.
The result: your contacts and customers see you, replies land where you already read them, and the email channel costs nothing extra. It is available on every plan, the Free plan included, and a single request can reach the same person by email and WhatsApp at once.
Side by side
Shared sender vs your own infrastructure
A generic comparison between sending through an address or number shared by a provider, and sending from your own mailbox and number with UnlimitedMessaging.
| Shared senderA provider's domain or number | Your own infrastructureYour mailbox and your number | |
|---|---|---|
| Sending identity | An address or number that belongs to the provider | Your usual email address and your own WhatsApp number |
| Reputation | Shared with the other senders using it | Yours alone, built on your own mail server and number |
| Replies | Depend on how the provider routes them | Back in your own mailbox and on your number, plus the dashboard inbox |
| Sent copies | Outside your own mailbox | Copied to your mailbox's Sent folder |
| Setup | Nothing to connect | Connect a mailbox over IMAP/SMTP and scan a QR code |
| Sending limits | Set by the provider | Set by your own email provider |
| Email channel price | Depends on the provider | Free, on every plan including Free |
What you keep
Six reasons to send from your own mailbox and number
Everything that makes a message trustworthy stays on your side. UnlimitedMessaging only carries it.
Your reputation stays yours
UnlimitedMessaging never provides the sending address. Emails go out from your address through your own mail server, so deliverability and reputation are yours alone, never pooled with strangers.
Recipients see you
Your customers get an email from the address they know and a WhatsApp message from the number they already saved.
Replies come back to you
Answers land in your own mailbox and on your own number, and in the dashboard inbox, grouped by thread. Sent emails are copied to your Sent folder.
Bounces paused for 30 days
When an address hard bounces, it is paused for 30 days for that mailbox, so you don't keep hitting a dead address and hurting your sender reputation.
Free on every plan
The email channel and multi-channel sending are available on every plan, the Free plan included. No credit card needed to start.
One request, both channels
A single POST /message reaches the same person by WhatsApp and by email, from your own number and your own address.
In practice
Email and WhatsApp in one request
Put a phone number and an email address in "to", list both channels, and UnlimitedMessaging sends from your own number and your own mailbox. One message is created per channel, grouped by a shared dispatchId. Each channel can override its text, HTML or subject.
{
"to": {
"phone": "+33612345678",
"email": "[email protected]"
},
"subject": "Your order is ready",
"text": "Hello, your order is ready for pickup.",
"channels": [
{
"channel": "WHATSAPP"
},
{
"channel": "EMAIL"
}
]
}The honest part
What to know before you switch
Sending from your own infrastructure gives you control, and control comes with a few things to keep in mind.
Your provider's sending limits apply
Emails go through your own mail server, so your email provider's own sending limits apply to them. Check your provider's documentation before planning large volumes.
Outlook, Hotmail and Microsoft 365 are not supported yet
They require OAuth sign-in, which is planned for later. Today you can connect Gmail with a Google app password, your own domain, or any IMAP/SMTP provider.
Your reputation is in your hands
Because the reputation is yours, so is its upkeep. Automatic bounce pausing helps, and good sending practices still matter on both channels.
A small footer on the Free plan
Free-plan emails and WhatsApp messages carry a small "Sent with UnlimitedMessaging.app" footer. The Medium and Max plans include No watermark and remove it.
Shared numbers still exist
UnlimitedMessaging also offers shared WhatsApp numbers. Linking your own number is the option we recommend when you want your customers to see you and keep full control.
Getting started
Connect your own sender in four steps
No sending domain to rent, no shared number to share. You bring what you already use.
- 1
Create a free account
The Free plan includes the email channel and multi-channel sending. No credit card.
- 2
Link your WhatsApp number
Scan a QR code from the dashboard with the phone that holds your number.
- 3
Connect your mailbox
Gmail with an app password, your own domain, or any IMAP/SMTP provider. Server settings are detected from your address.
- 4
Send
Use POST /message, the TypeScript or Python SDK, the dashboard, or the MCP server from Claude or ChatGPT.
FAQ
Questions about sending from your own mailbox and number
Sources
Sources & references
To check the information in this article for yourself:
Written by
Ilian · Senior Software Engineer
A senior software engineer, he founds and runs several tech companies. He builds products around messaging APIs, automation and AI integration, and shares here what he learns while building.
Your mailbox, your number, one request.
Connect your own mailbox and your own WhatsApp number and send to your customers by email and WhatsApp at once. Free on every plan, no credit card.
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