G-suite email settings not worked while sending email in rails - ruby-on-rails

Question

I used G-suite email setting for sending emails from Rails application. This is my client G-suite email. Generally I used my gmail settings and it's work but G-suite email settings not work. Below code:
config.action_mailer.smtp_settings = {
:address => "smtp-relay.gmail.com",
:port => 587,
:user_name => "info#XXXX.com",
:password => "XXXXXX",
:authentication => "plain",
:domain => "gmail.com",
:enable_starttls_auto => true
}
I used address: "smtp.gmail.com" as well but not working.
I got error: SMTP: authentication failed and sometimes nothing but not received email.
Anyone have idea or same experience solutions.
Thanks

Answer 1

there is this configuration in gmail that COULD be the cause of the problem. I am not sure it would result with an error: SMTP: authentication failed
this is the guide to allow the unsafe apps
Change your settings to allow less secure apps into your account.
We don't recommend this option because it can make it easier for someone to break into your account. If you want to allow access anyway, follow these steps:
Go to the "Less secure apps" section of my Account.
Turn on Allow less secure apps. (Note: If your administrator has locked less secure app account access, this setting is hidden.)
also I found similar post for this problem, for example a similar issue was solved in this so question

Answer 2

These settings worked for me:
config.action_mailer.default_url_options = { :host => 'localhost:3000' }
config.action_mailer.perform_caching = false
config.action_mailer.delivery_method = :smtp
# SMTP settings for gmail
config.action_mailer.smtp_settings = {
:address => "smtp.gmail.com",
:port => 587,
:user_name => 'info#example.com', # Change this to the email you're sending from
:password => 'your_password_goes_here', # Change this to your password
:authentication => "plain",
:enable_starttls_auto => true
}
One extra tip. By default: config.action_mailer.raise_delivery_errors = false set to true so you can see any error messages in your browser/console
NOTE: in order for the mailer to work with any google email account you must have 'Allow less secure apps' turned on.
To do this, first go to the G-Suite admin console and turn on Security -> Advanced Security Settings and check the radio button: "Allow users to manage their access to less secure apps"
Now login to your G-Suite user account, go to My Account -> Sign-in & security. At the bottom you'll see Allow less secure apps. Turn that on.
You're good to go!