
(or pick the Google Workspace account) you want GHL to send from / sync with.
Sign into the Google account > Google Account > Security > "2-Step Verification" and turn it on.
This is required so you can create an app password for SMTP if you won't use OAuth. (GHL docs require this for Gmail SMTP). HighLevel Support Portal
(used instead of your normal Google password):
Google Account > Security > "App passwords" > select "Mail" and device (or "Other" and name it "GHL SMTP") > Create > copy the 16-char password. You'll paste this into GHL when asked for the SMTP password. HighLevel Support Portal

(Use this if you want GHL to send email FROM your Gmail address via Gmail's SMTP servers.)
In GHL, go to the sub-account you want to configure. (If you're an agency, switch to the correct sub-account first).
Navigate: Settings → Email Services (or SMTP & Mailgun in some accounts). Click Add Service. HighLevel Support Portal+1
Choose Provider: Gmail from the dropdown.
Fill in the fields (example values):
Click Save. GHL will attempt to authenticate — if successful, GHL can send mail using that SMTP connection.
Troubleshooting: if you get authentication errors, verify 2-step verification + app password are correct and that you're in the correct sub-account when adding the SMTP. GHL notes special cases (e.g., Workspace admin settings) in their docs. HighLevel Support Portal
(Recommended if you want incoming messages to show inside GHL and replies to be tracked.)

Send a test email from GHL to a personal address (and to a Gmail, Outlook). Confirm it arrives and reply — check it shows in GHL conversations if you enabled 2-way sync.
SPF/DKIM: If you want better deliverability long-term, set up SPF and DKIM for the domain you send from (if you use a domain email like you@yourdomain.com). GHL recommends using verified sending domains or Mailgun for higher volume. (If you only use @gmail.com personal addresses, Gmail manages much of this but deliverability can be lower than a properly signed domain). HighLevel Support Portal+1
If deliverability is critical/scaled: consider Mailgun or Amazon SES as the sending provider and verify domain + DNS — GHL has step-by-step guides for Mailgun. HighLevel Support Portal

There are two common ways to send sequences in GHL: Campaigns (Email Marketing) for scheduled/one-offs and Workflows (Automation) for automated drip sequences triggered by an event. For automated sequences, use Workflows.
Plan the sequence: decide triggers (e.g., Form Submitted, Tag Added, New Contact), delays between emails (e.g., Day 0, Day 2, Day 5), and any conditional paths (if opened/clicked, then X).
In GHL: go to Automation (or Workflows) → Create Workflow → choose Start from scratch or a Recipe (there's an "Email Drip Sequence" recipe). HighLevel Support Portal+1
Add a Trigger (example: Form Submitted → filter to the specific form). HighLevel Support Portal
Add Actions in the order you want:
Set Batch Size (for drip sending to avoid throttling) if your workflow has many contacts — the workflow UI often has "Drip" or "Batch Size" options for pacing. HighLevel Support Portal
Publish & Test: use a test contact to confirm each step fires, emails arrive, links track, and opens/clicks evaluate correctly.
Monitor: go to Email Marketing → Campaigns → Workflow Campaigns to view analytics for emails sent through workflows. You can edit a workflow and republish as needed. HighLevel Support Portal+1
Send test emails to at least two different providers (Gmail, Outlook).
Reply to a test and verify it appears in GHL Conversations (if 2-way sync enabled).
Confirm the "From" address is correct and SPF/DKIM is set (for domain senders).
Check links, merge tags, and image rendering.
If using Gmail SMTP app password, confirm authentication didn't expire and there are no admin restrictions in Workspace.

For higher volume and better deliverability use a verified sending domain + Mailgun/SES instead of sending large volumes through Gmail's SMTP. GHL docs and guides explain Mailgun setup step-by-step. HighLevel Support Portal
Use personalized subject lines and keep the first 1–2 lines strong — these heavily affect open rate.
Add unsubscribe language if sending marketing to lists (legal/compliance).
Keep a small initial batch (100–200) to watch deliverability before scaling — workflows allow batching. HighLevel Support Portal
Gmail setup + email sequence in GHL