Custom SMTP set up
You can use custom SMTP in Quickmail Pro accounts to send emails out from your custom SMTP service on behalf of your G Suite email account. G Suite email limits will no longer apply if you're using custom SMTP to send out emails. However, Quickmail initial email limits will still apply (500 initial emails/day)
Note: You should NEVER use custom SMTP with a free Google "@gmail.com" email address.
Gmail's DMARC policies will not go well with custom SMTP and will result to your emails going to trash.
Setting up a custom SMTP to send email can be done in the Settings of your inbox.
Find the custom SMTP fields and fill out with your Custom SMTP credentials:
(Changes made are saved automatically)
Set up example (using Sendgrid):
SMTP Address: smtp.sendgrid.net
SMTP Login: should be your login account to sendgrid
SMTP Password: should be your password to your account
SMTP Authentification: can be left to Default
For more information, see SendGrid documentation