# Mailers

> What a BooleanSMTP mailer connection is, the five providers you can add today, and how to manage your connections.

A **mailer** in BooleanSMTP is a connection: one mail provider, its credentials, and the sender
details your site uses when it sends through that provider. Every email your site sends — contact
forms, password resets, order receipts — goes out through whichever connection BooleanSMTP resolves
for it, instead of your web server's own mail setup.

## Pick a mailer

Five providers are ready to connect:

| Mailer | How it sends | Best for |
| --- | --- | --- |
| [Amazon SES](/mailers/ses/) | HTTPS API or SMTP | High-volume sending at low cost |
| [Google Workspace](/mailers/google/) | Gmail API (OAuth) or SMTP (app password) | Business email already on Google |
| [Microsoft Outlook](/mailers/outlook/) | Microsoft Graph API only | Business email already on Microsoft 365 |
| [Custom SMTP](/mailers/smtp/) | SMTP, to any server you configure | Your host's mail server, or a provider not listed here |
| [PHP Mail](/mailers/php/) | Your server's own `mail()` function | Local testing, or a last-resort fallback |

![The Choose a Mailer screen in BooleanSMTP, with Amazon SES, Google Workspace, Microsoft Outlook, Custom SMTP and PHP Mail selectable and the other providers marked Soon.](../../../assets/screenshots/choose-a-mailer.webp)

Other providers listed on this screen are marked **Soon** — they aren't connectable yet.

Not sure which of the five fits your site? See [Which mailer should I use?](/learn/choose-a-mailer/).

## Manage your connections

Add a connection under **BooleanSMTP → Mailers → Add Connection**. The first one you add during
setup becomes your primary connection; add a second under **Settings → Fallback Connection** so
BooleanSMTP has somewhere to retry a failed send.

![The Mailer Connections list in BooleanSMTP, with the Add Connection button and the Provider, Sender, Mode, Status, Health and Actions columns.](../../../assets/screenshots/mailers-list.webp)

Each row shows the connection's **Provider**, **Sender** address, **Mode**, **Status** (active or
disabled), and **Health** (whether its last send succeeded); **Actions** lets you send a test, edit,
or delete it.