have gmail business account but don't receive mails - gmail

I have business gmail account, and when I fill in contact form from website in webmail/roundcube I receive mails immediately. But in GMAIL inbox no mail.
I have tried to send mail to that address from my personal email and received. Issue is that don't receive from website's form.

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I am using Nodemailer to send the email to user. But the user is not receiving the email. And I am using etheral mail in Nodemailer. It shows that(In Provided Image) the email is successfully sent but the user is not receiving the email in his Account . I have tried with with gmail, outlook mail as well as with temp mail but the email wasn't received in any of them.
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I am working on a MERN stack and I can send out email to users using nodemailer. However, I would like the users of the application to be able to send email to the admin too. So far, it is the admin who can send out emails to users. How about the option for any to click the contact page, fill in their name, email address and email body and send out email to the admin of the application.
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We have all spam and phishing emails being forwarded to an IT department for review. We currently have individuals downloading the original email in their gmail inbox and then attaching it to an email to the spam box. This has caused a lot of complaints from less technical users.
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Do any of the fields in the gmail headers stay constant when forwarding an email so that a forwarded email can be used to query the original email in a users inbox ?
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I'm using PHPMailer on PHP on Apache2.0 on Unix with sendmail to create a webservice that can send emails to some customers.
This server doesn't have a domain and the email will have "From: xxx#domain.com" header as they will be sent in behalf of the mother website (let's say domain.com).
Now, everything works, but Gmail and Hotmail detect my email as spam.
It seems legit as there is currently no correlation between the sender server and the mail sender address.
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Thank you

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I have a PHP mailer that sends out auto emails to confirm registration and alerts when the customer's online number is pinged.
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Any ideas why?

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