Zoho Mail SMTP and IMAP Settings for Cold Email

Server settings

These values come from Zoho’s public help pages. Zoho also shows the exact servers for your account and data center under Settings, so check there if a connection fails.

• Organization (custom domain) SMTP: smtppro.zoho.com, port 465 (SSL) or 587 (TLS)
• Organization IMAP: imappro.zoho.com, port 993 (SSL)
• Personal (@zohomail.com) SMTP: smtp.zoho.com, port 465 (SSL) or 587 (TLS)
• Personal IMAP: imap.zoho.com, port 993 (SSL)
• Username: the full email address; the From address must match the account or one of its aliases

Before you connect

Zoho requires IMAP access to be switched on before an external app can read the mailbox: Settings → Mail Accounts → select the address → enable IMAP Access.

• Enable IMAP Access in Zoho Mail settings.
• If two-factor authentication is on, create an application-specific password and use it instead of your normal password.
• Publish SPF, DKIM and DMARC for the sending domain before any campaign.

What Zoho publishes about sending limits

Zoho’s rates-and-limits page describes outgoing limits as dynamic, based on sender reputation, recipient engagement and contact quality, and lists a range of 50–500 emails per hour. It also lists a per-email recipient cap of 100 for free accounts and 150 for paid accounts (To, Cc and Bcc combined). After a limit is reached, sending can be blocked for up to an hour.

Zoho states that bulk or burst sending is not permitted under its business usage policy. Treat a Zoho mailbox as a low-volume, one-to-one sender: small daily limits, steady pacing and no attempt to work around a restriction.

Connecting Zoho to MailQV

Connect the mailbox through MailQV’s SMTP/IMAP option with the settings above. Set a conservative daily limit on the mailbox; MailQV keeps that limit per mailbox and spreads campaign sends across the mailboxes you select.