How to Google smtp server relay

Published November 1, 2024 · Updated July 16, 2026 · SMTP & Deliverability

Google's SMTP servers can relay your outgoing mail — handy if you already live in Gmail or Google Workspace. But there are two very different Google relay options, each with its own limits, and knowing which one you are using saves a lot of confusion. Here is how the Google SMTP relay works and where it fits.

The two Google SMTP options

Option	Server	Daily limit
Gmail SMTP (send as user)	`smtp.gmail.com`	~500–2,000
Workspace SMTP relay	`smtp-relay.gmail.com`	Higher, per policy

How to set it up

Use smtp.gmail.com (or smtp-relay.gmail.com for Workspace) on port 587, STARTTLS.
Authenticate with your Google account (an app password if 2-step verification is on).
For the Workspace relay, an admin authorises your sending IPs or domains in the Admin console.
Confirm SPF/DKIM/DMARC are set for your domain.

The ceiling: Even the Workspace relay is designed for business mail, not marketing blasts — and Gmail's user SMTP caps out fast. For real bulk volume, a dedicated SMTP is the way.

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Frequently asked questions

What is Google's SMTP server address?

smtp.gmail.com for sending as a user, or smtp-relay.gmail.com for the Google Workspace relay — both on port 587 with STARTTLS.

What is the difference between Gmail SMTP and the Workspace relay?

Gmail SMTP sends as one user with low caps; the Workspace relay allows higher volume for your organisation, authorised by an admin. Neither is built for marketing blasts.

How do I send more than Google allows?

Use a dedicated SMTP server with its own IP and no daily cap for bulk and marketing, keeping Google for everyday business mail.