The recommended approach is to create a relay connector that allows Jim2 to send outbound emails without requiring authentication via Gmail.
Requirement
A static IP address is necessary for this setup. If you are a Jim2Cloud customer, please contact support@happen.biz to request the static IP address of your Jim2Cloud server.
1.DNS Change
You will require an administrator of your public DNS records to make this change. WHOIS lookup can be used to find your DNS service host.
Please add include:spf.j2c.jim2.com.au to your existing SPF record for your domain.
Example entry:
Host: yourwebsite.com.au
Record Type: TXT
Value: "v=spf1 ip4:123.45.67.89 include:spf.protection.outlook.com include:spf.j2c.jim2.com.au -all"
Example DNS zone editor:

2.Relay connector
▪Sign in to your Google Admin Console using an administrator account.
▪In the Admin Console, go to Menu > Apps > Google Workspace > Gmail > Routing.

3.Scroll to SMTP relay service and click Configure.

4.Enter the required settings:
▪Name: Enter a name for the configuration (eg. Jim2 Email Relay).
▪Allowed Senders:
–Select Only addresses in my domains.
▪Authentication:
–Tick Only accept mail from the specified IP addresses and add the static IP of your Jim2 server. (For Jim2Cloud customers, you will need to be obtain your server IP address from support@happen.biz.)
▪Encryption:
–Tick Require TLS encryption.

Once complete, update the default SMTP server to use Gmail via Tools > Options > Other > Email:
▪Default Server: smtp-relay.gmail.com
▪Leave Username and Password fields blank
▪Select Port 587
▪Use STARTTLS for SSL.

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