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Sync Notify
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Connect Gmail and Google Workspace.

Use Gmail's authenticated SMTP service with your full email address and a Google app password. Your account's sending limits still apply.

4 MIN READALL PLANSUPDATED OCT 2026

What you need.

01

A Gmail or Google Workspace mailbox that can send mail

02

2-Step Verification enabled on the Google Account

03

A 16-digit app password created for Sync Notify

04

Permission from your Google Workspace administrator if app passwords are restricted

Steps

  1. Turn on 2-Step VerificationSign in to your Google Account. Open Security and turn on 2-Step Verification.
  2. Create an app passwordOpen App passwords, create one for Sync Notify, and copy the 16-digit password.
  3. Add the connection in Sync NotifyIn Sync Notify, use smtp.gmail.com, port 587 with STARTTLS, your complete Gmail or Workspace address as the username, and the app password instead of your normal account password.
  4. Test and sendRun Test and send. Keep the From address the same as the authenticated mailbox unless your Google Workspace administrator has configured a permitted alias.

Settings to enter.

Sync Notify fills these in when you choose the Gmail preset. They are here so you can check them.

GMAIL PRESET
SMTP host
smtp.gmail.comAuthenticated Gmail SMTP server
Recommended port
587STARTTLS
Alternative port
465SSL/TLS
Username
Full email addressFor example, you@yourstore.com
Password
16-digit app passwordDo not use the normal Google Account password
Provider limits
Gmail: 500/day; Workspace SMTP: 2,000/dayGoogle may also restrict recipients or suspicious traffic; limits can change

Common errors.

535Username and Password not accepted

Google rejected the credentials, often because the normal account password was used. Use the complete email address and generate a new app password after confirming 2-Step Verification is on.

ERR 02App passwords is missing

The option can be unavailable for organization accounts, Advanced Protection, or accounts that use security-key-only 2-Step Verification. Ask the Workspace administrator whether app passwords are allowed, or use another supported SMTP mailbox.

ERR 03Daily sending limit reached

The mailbox reached Google's current daily message or recipient allowance. Pause sending until Google restores the allowance, then lower the sending rate or move to a provider intended for the required volume.

Official references.