SMTP · password or App Password

How to connect
Zoho Mail.

Find the correct Zoho server for your account and data center, then use MailboxWarm’s SMTP connection.

Connection preview. You can read this guide and save a mailbox for later. Live authorization and warm-up remain off. Do not enter real credentials while the connection form is disabled.

Before you start

  • A Zoho mailbox with authenticated SMTP access.
  • The server configuration shown inside your Zoho account.
  • An app-specific password if two-factor authentication requires one.

Step-by-step setup

  1. Find your account’s SMTP settings

    In Zoho Mail, open Settings → Mail Accounts and the server configuration for your address. Copy the outgoing server shown for your account type and data center.

  2. Prepare the right password

    If your account uses two-factor authentication, create an application-specific password in Zoho Accounts. Use your full email address as the SMTP username.

  3. Choose Other provider in MailboxWarm

    Open Mailboxes → Add mailbox, choose Other provider, and enter your sending email address. Named SMTP services all use this same Other provider connection option.

  4. Enter the connection details

    When connections are enabled, enter the SMTP values listed below. Choose Test & connect. MailboxWarm checks authentication and the encrypted connection without sending a message.

Connection settings

Match these values to the fields in MailboxWarm. Keep passwords and keys private.

Connection option
Other provider
SMTP host
Use Zoho’s account-specific server
US personal / free organization example
smtp.zoho.com
US paid organization example
smtppro.zoho.com
Encryption / port
STARTTLS / 587
SMTP username
Your full Zoho email address
SMTP password
Your permitted password or App Password

SMTP sends; it does not read your inbox. This connection does not include IMAP access to your mailbox. Placement and rescue activity concern the controlled seed inboxes receiving warm-up messages. Provider-specific compatibility still needs live validation.

Check the result

In today’s preview, expect Mailbox saved for later. When connections are enabled, a successful check shows Mailbox connected, with warming still paused. A failed connection check is not proof of delivery or a reason to add the same mailbox again.

Once live warming is available, choose the mailbox’s plan and schedule before starting. Connecting alone does not begin warm-up, and your provider’s sending limits still apply.

Open setup preview

Troubleshooting

The server rejects the connection

Check the exact server in your Zoho account. The examples above are not universal across account types or regions.

Authentication or relay is denied

Use the full email address and an allowed sender address. With two-factor authentication, check whether an app-specific password is required.

Provider resources

Provider menus and account policies can change. Use their official documentation for the latest requirements.

Settings reviewed September 12, 2026 · Documentation review, not a live connection test.