# Send from your own mailbox and number: why rent a sender? > Why send from your own mailbox and WhatsApp number instead of a shared sender: your reputation, your identity, your replies. Free on every plan. Source: https://unlimitedmessaging.app/articles/send-from-your-own-mailbox-and-number Your own sender # 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. [Start for free](https://app.unlimitedmessaging.app)[See pricing](https://unlimitedmessaging.app/pricing) The context ## Who is actually sending your messages? Mailbox providers judge a message largely by who sends it: [Google's sender guidelines](https://support.google.com/a/answer/81126) 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. ![Illustration: an email address and a phone number with a key, with the headline “Your mailbox, your number”.](https://unlimitedmessaging.app/_next/image?url=%2Fassets%2Farticles%2Fcovers%2Fsend-from-your-own-mailbox-and-number-en.png&w=3840&q=75) Definition Own sending infrastructure Sending from an email address and a WhatsApp number that belong to you, through your own mail server and your own linked phone, instead of an address or number shared by a sending provider. Also called your own sender, own sending address, own mailbox, own number, BYO sender. 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 sender vs your own infrastructure__ | 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. 1. 01 ### Recipients see you Your customers get an email from the address they know and a WhatsApp message from the number they already saved. 2. 02 ### 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. 3. 03 ### 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. 4. 04 ### 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. 5. 05 ### 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. POST /messageJSON ``` { "to": { "phone": "+33612345678", "email": "client@example.com" }, "subject": "Your order is ready", "text": "Hello, your order is ready for pickup.", "channels": [ { "channel": "WHATSAPP" }, { "channel": "EMAIL" } ] } ``` Base URL https://api.unlimitedmessaging.app, header Authorization: Bearer followed by your API key. Without accountId, your only active account on each channel is used. 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. 1. 01 ### 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. 2. 02 ### 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. 3. 03 ### 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. 4. 04 ### 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. 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. 01 ### Create a free account The Free plan includes the email channel and multi-channel sending. No credit card. 2. 02 ### Link your WhatsApp number Scan a QR code from the dashboard with the phone that holds your number. 3. 03 ### Connect your mailbox Gmail with an app password, your own domain, or any IMAP/SMTP provider. Server settings are detected from your address. 4. 04 ### Send Use POST /message, the TypeScript or Python SDK, the dashboard, or the MCP server from Claude or ChatGPT. The key idea ### UnlimitedMessaging is the transport, you are the sender We never provide your sending address. Your mailbox, your number, your reputation and your replies stay yours. We carry the message and put email and WhatsApp behind one request, free on every plan. FAQ ## Questions about sending from your own mailbox and number No. UnlimitedMessaging is only a transport and never provides the sending address. Emails leave from your own address through your own mail server, so deliverability and reputation stay yours. Yes. The email channel and multi-channel sending are available on every plan, the Free plan included, with no credit card. On the Free plan, emails carry a small "Sent with UnlimitedMessaging.app" footer, which Medium and Max remove. Gmail with a Google app password, a mailbox on your own domain, or any provider that offers IMAP/SMTP. Server settings are detected from your address. Outlook, Hotmail and Microsoft 365 are not supported yet because they require OAuth, planned for later. To your own mailbox and your own WhatsApp number, as usual. They also show up in the dashboard inbox, grouped by thread, and email replies keep the thread. On plans with webhook reception (Medium and Max), incoming messages are pushed to your webhook. Yes. Every email sent through UnlimitedMessaging is copied to your mailbox's Sent folder, so your mailbox keeps the full history. When a hard bounce is detected, that address is paused for 30 days for the mailbox that sent to it. This avoids repeatedly sending to a dead address, which would hurt your sender reputation. Sources ## Sources & references To check the information in this article for yourself: 1. [01Email sender guidelines↗Google Workspace Admin Help](https://support.google.com/a/answer/81126) 2. [02Sign in with app passwords↗Google Account Help](https://support.google.com/accounts/answer/185833) 3. [03Turn on 2-Step Verification↗Google Account Help](https://support.google.com/accounts/answer/185839) 4. [04RFC 5322 - Internet Message Format↗IETF](https://www.rfc-editor.org/rfc/rfc5322) ![Ilian, senior software engineer](https://ilianazz.com/images/iliazz.png) Written by [Ilian](https://unlimitedmessaging.app/authors/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. [View LinkedIn profile↗](https://www.linkedin.com/in/ilianAzz/)Updated October 24, 2026 ![](https://unlimitedmessaging.app/assets/logos/whatsapp.svg)![](https://unlimitedmessaging.app/assets/logos/email.svg)![](https://unlimitedmessaging.app/assets/logos/sms.svg) ## 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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