---
title: "SMTP & IMAP Settings for Cold Email (Gmail, Outlook, Zoho)"
description: "Connect any mailbox to Prosyo with SMTP/IMAP. Host and port settings for Google Workspace, Microsoft 365, Zoho, GoDaddy, Hostinger and more."
url: "https://prosyo.com/docs/connect-accounts/smtp-imap/"
image: "https://prosyo.com/wp-content/uploads/2026/10/Prosyo-wordmark-white-vector.svg"
language: "fr"
---

# SMTP & IMAP Settings for Cold Email (Gmail, Outlook, Zoho)

1. [Prosyo Docs](https://prosyo.com/fr/docs/)
2. [Connect your accounts](https://prosyo.com/fr/docs/connect-accounts/)
3. Connect a custom SMTP/IMAP mailbox

Last updated November 6, 2026 5 min read

**On this page**

- Who can connect one
- What you need
- Connect
- Settings for common providers
- Google Workspace / Gmail app password
- Microsoft 365 / Outlook
- Before you send: protect your domain
- Custom SMTP/IMAP or Gmail/Outlook?
- Common errors

A custom mailbox lets Prosyo send campaign emails through **your own mail server** (SMTP) and read replies back into your **Inbox** (IMAP). It works with almost any email provider.

## Who can connect one#

| Plan | SMTP/IMAP mailbox |
| --- | --- |
| 7-day trial | 1 included |
| Starter (paid) | Not included. Starter is LinkedIn-only. |
| Multichannel | Uses your email seat (1 mailbox: SMTP/IMAP or Gmail/Outlook), and you can buy more |
| Agency / Team | Uses an email seat (1 per billed seat: SMTP/IMAP or Gmail/Outlook), and you can buy more |
| Enterprise | Uses the plan's email seats (up to 100 mailboxes: SMTP/IMAP or Gmail/Outlook) |
| Penny SDR All-in | Uses the plan's email seat (1 mailbox: SMTP/IMAP or Gmail/Outlook) |
| AppSumo | 1 included, and you can buy more |

Only owners and admins can add a mailbox.

Upgrade

Need more sending mailboxes? Extra **SMTP/IMAP seats** are available on Multichannel, Agency / Team and AppSumo plans. [See add-ons](https://prosyo.com/fr/docs/billing/add-ons-and-upgrades/).

## What you need#

- The **SMTP host and port** of your provider
- The **IMAP host and port** of your provider
- The mailbox **username**, usually the full email address
- The mailbox **password**, or an **app password** if your account uses two-step verification

## Connect#

1. Go to **Settings → Accounts**.
2. In the **Custom SMTP / IMAP** card, click **Add SMTP/IMAP**.
3. Fill in the **Add SMTP/IMAP mailbox** form:

| Field | What to enter | Example |
| --- | --- | --- |
| **SMTP host** | Outgoing mail server | `smtp.yourdomain.com` |
| **Port** | `587` (STARTTLS) or `465` (SSL) | `587` |
| **Use SSL/TLS (port 465)** | Tick only when you use port 465 | off |
| **Username** | Mailbox login | `you@yourdomain.com` |
| **Password** | Mailbox password or app password | •••••••• |
| **IMAP host** | Incoming mail server | `imap.yourdomain.com` |
| **Port** (IMAP) | Almost always `993` | `993` |
| **IMAP username** | Leave blank to use the SMTP username | |
| **IMAP password** | Leave blank to use the SMTP password | |
| **From email** | The address prospects see | `you@yourdomain.com` |
| **From name (optional)** | The name prospects see | `Priya Sharma` |

4. Click **Verify & connect**. Prosyo tests both SMTP and IMAP before saving.
5. The mailbox appears as **Healthy**. Your credentials are stored encrypted.

## Settings for common providers#

| Provider | SMTP host | SMTP port | IMAP host | IMAP port | Password |
| --- | --- | --- | --- | --- | --- |
| **Google Workspace / Gmail** | `smtp.gmail.com` | 587 | `imap.gmail.com` | 993 | App password (turn on 2-Step Verification first) |
| **Microsoft 365 / Outlook** | `smtp.office365.com` | 587 | `outlook.office365.com` | 993 | Usually not possible. Use the one-click Outlook connection. See below. |
| **Zoho Mail** | `smtp.zoho.com` (`smtp.zoho.in` / `smtp.zoho.eu` by region) | 587 or 465 | `imap.zoho.com` (same region) | 993 | App-specific password if 2FA is on. Turn on IMAP access in Zoho settings. |
| **GoDaddy (Microsoft 365)** | `smtp.office365.com` | 587 | `outlook.office365.com` | 993 | Usually not possible. Use the one-click Outlook connection. See below. |
| **Hostinger** | `smtp.hostinger.com` | 465 (SSL) | `imap.hostinger.com` | 993 | Mailbox password |
| **Namecheap Private Email** | `mail.privateemail.com` | 465 (SSL) | `mail.privateemail.com` | 993 | Mailbox password |
| **Yahoo Mail** | `smtp.mail.yahoo.com` | 465 (SSL) | `imap.mail.yahoo.com` | 993 | App password |
| **cPanel hosting** | `mail.yourdomain.com` | 465 (SSL) | `mail.yourdomain.com` | 993 | Mailbox password |

Provider settings change from time to time. If a value doesn't work, check your provider's help page for "SMTP settings".

### Google Workspace / Gmail app password#

1. Turn on **2-Step Verification** in your Google Account.
2. Open [https://myaccount.google.com/apppasswords](https://myaccount.google.com/apppasswords).
3. Create an app password named *Prosyo* and copy the 16-character code.
4. Paste it in both the SMTP and IMAP password fields (or only in SMTP, and leave IMAP blank).

If **App passwords** doesn't appear, your Google Workspace admin has turned it off. Ask them to allow it, or use the one-click [Gmail / Google Workspace connection](https://prosyo.com/fr/docs/connect-accounts/gmail-google-workspace/) instead.

### Microsoft 365 / Outlook#

Prosyo's custom mailbox signs in with a password, and Microsoft no longer allows password sign-in for IMAP on most Microsoft 365 and Outlook.com mailboxes. Use the one-click [Outlook / Microsoft 365 connection](https://prosyo.com/fr/docs/connect-accounts/outlook-microsoft-365/) instead.

Try the settings above only if your Microsoft 365 admin confirms that password sign-in (**Authenticated SMTP** and **IMAP**) is still allowed for your mailbox. The admin also checks that both are turned on for it:

1. Open the **Microsoft 365 admin center** → **Users** → **Active users**.
2. Select your user → **Mail** tab → **Manage email apps**.
3. Tick **Authenticated SMTP** and **IMAP**, then save.
4. Wait up to an hour, then connect again in Prosyo.

## Before you send: protect your domain#

For good deliverability, make sure your sending domain has:

- **SPF**, which lists the servers allowed to send for your domain
- **DKIM**, which signs your messages
- **DMARC**, which tells receivers what to do with unsigned mail

Your email provider's admin panel shows the exact records to add at your DNS host.

Tip

Many teams send outreach from a **secondary domain** (for example `getacme.com` instead of `acme.com`) so their main domain's reputation stays safe. Warm up any new mailbox: start near **25 emails per day** and increase slowly.

## Custom SMTP/IMAP or Gmail/Outlook?#

| | Custom SMTP/IMAP | Gmail / Outlook one-click |
| --- | --- | --- |
| Works with | Any provider | Google and Microsoft accounts |
| Setup | Host, port and password | Sign in with Google or Microsoft |
| Replies in Inbox | Yes, via IMAP | Yes |
| Plans | Trial, Multichannel, Agency / Team, Enterprise, Penny SDR All-in, AppSumo | Multichannel, Agency / Team, Enterprise, Penny SDR All-in, or an extra LinkedIn/email seat |
| Seat it uses | An email seat or an SMTP/IMAP seat | An email seat or an extra LinkedIn/email seat |

On plans with email seats, each seat holds **one** mailbox, SMTP/IMAP or Gmail/Outlook, whichever you connect.

## Common errors#

| Message or symptom | Fix |
| --- | --- |
| "Could not connect to the SMTP server" or "Could not connect to the IMAP server" | Check the host, port, username and password. With 2FA, use an app password. On Microsoft 365, see above. |
| Connection timed out | Check the host and port. Try 465 with **Use SSL/TLS** ticked, or 587 with it unticked. |
| SMTP works, IMAP fails | Turn on IMAP in your mail provider's settings, and check the IMAP host and port 993. |
| Emails send but no replies in Inbox | IMAP is failing. Open **Settings → Accounts**, click **Test connection**, then **Sync now**. |
| You changed the mailbox password | SMTP/IMAP mailboxes have no **Reconnect** button. An owner or admin disconnects the mailbox and adds it again with the new password. Then pick it under **Email accounts** on each campaign's **Sending & safety** tab, and click **Review & resume** if the campaign paused. |
| No **Add SMTP/IMAP** button, and the card says **Not on Starter** | You're on paid Starter, which is LinkedIn-only. Upgrade to Multichannel or Agency / Team. |
| No **Add SMTP/IMAP** button on Multichannel or Agency / Team | Your email seats are all in use (a Gmail/Outlook mailbox uses one too). Disconnect one, or add an extra SMTP/IMAP seat on **Settings → Billing**. Also check you're an owner or admin. |

Transactional emails from Prosyo itself, such as sign-in links and receipts, never use your mailbox.

## Related guides

[Email deliverability Keep cold emails out of spam: set up SPF, DKIM and DMARC, use a secondary domain, warm up mailboxes, cap volume and write emails that land.](https://prosyo.com/fr/docs/help/email-deliverability-guide/) [Gmail / Google Workspace Connect Gmail or Google Workspace to Prosyo in one click, and fix the "Access blocked" / admin_policy_enforced error in the Google Admin console.](https://prosyo.com/fr/docs/connect-accounts/gmail-google-workspace/) [Outlook / Microsoft 365 Connect Outlook or Microsoft 365 to Prosyo and fix "Need admin approval", AADSTS90094 and AADSTS65001 by granting admin consent in Microsoft Entra.](https://prosyo.com/fr/docs/connect-accounts/outlook-microsoft-365/) [Multichannel Combine LinkedIn and cold email in one sequence with full copy, conditions and deliverability tips to reach prospects where they answer.](https://prosyo.com/fr/docs/playbooks/multichannel/)