How to Fix Emails from Gmail Turning Into Spam

Email Delivery Challenges: Gmail vs. Other Domains

My ASP.NET MVC project running on.NET 4.5.2 uses SMTP to deliver emails. Emails sent to Gmail addresses frequently get in the spam folder, even if the majority of them are delivered correctly.

This dilemma begs the question of whether the mail server configuration is the only factor contributing to the issue, or if there is a problem with the development process as well. By comprehending the causes behind this, email delivery rates can be increased and crucial messages can be sent to the right people.

Knowing the Scripts for Sending Emails

The ASP.NET MVC example's backend script is made to use the SMTP protocol to deliver emails. It creates an email message by setting the sender, recipient, subject, and body using the MailMessage class. The email is subsequently sent via the Office 365 SMTP server by using the SmtpClient class. Using NetworkCredential to verify the sender of the email and EnableSsl to guarantee a safe email transmission are crucial commands. To conform to current security requirements, the ServicePointManager.SecurityProtocol is set to Tls12.

The script manages user interactions for email sending on the front end. After adding an event listener to the send button and removing any spammy terms from the email, it transmits the message using a fetch request. While fetch sends an asynchronous call to the backend API, addEventListener registers the click event. Before being sent, the email content is transformed using JSON.stringify to JSON format. By using two methods, emails are transmitted securely and with the correct formatting, which lowers the chance that Gmail will flag them as spam.

using System.Net;
using System.Net.Mail;
using System.Threading.Tasks;

public class EmailService
{
    public async Task SendEmailAsync(string destination, string subject, string body)
    {
        var email = new MailMessage("your-email@example.com", destination);
        email.Subject = subject;
        email.Body = body;
        email.IsBodyHtml = true;

        var mailClient = new SmtpClient("smtp.office365.com", 587)
        {
            Credentials = new NetworkCredential("your-email@example.com", "your-password"),
            EnableSsl = true
        };

        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
        await mailClient.SendMailAsync(email);
    }
}

// Usage Example
var emailService = new EmailService();
await emailService.SendEmailAsync("recipient@gmail.com", "Subject", "Email Body");

document.getElementById("sendEmailButton").addEventListener("click", function() {
    var emailBody = document.getElementById("emailBody").value;
    var emailSubject = document.getElementById("emailSubject").value;

    // Basic validation to check for spammy content
    if(emailBody.includes("spam") || emailSubject.includes("spam")) {
        alert("Please remove spammy content from your email.");
        return;
    }

    // Proceed with sending email
    sendEmail(emailSubject, emailBody);
});

function sendEmail(subject, body) {
    // Code to send email via backend API
    fetch("/api/send-email", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ subject: subject, body: body })
    }).then(response => {
        if (response.ok) {
            alert("Email sent successfully!");
        } else {
            alert("Failed to send email.");
        }
    });
}

Fixing ASP.NET MVC Spam Issues with Gmail

Concerning emails sent to Gmail domains that wind up in spam, SPF, DKIM, and DMARC records are additional significant factors to take into account. Email providers can confirm that your emails are originating from a reliable source with the use of these DNS records. Correctly configuring these records guarantees that your domain is trusted, which lowers the possibility that your emails will be flagged as spam. Emails can be sent on behalf of your domain by mail servers that are approved by SPF (Sender Policy Framework).

While DMARC (Domain-based Message Authentication, Reporting, and Conformance) expands on SPF and DKIM by offering guidance on how to handle emails that fail authentication, DKIM (DomainKeys Identified Mail) adds a digital signature to your emails. Maintaining proper setup of these records can greatly enhance email deliverability to Gmail and other services. Additionally, you can make sure your emails arrive in the inbox by keeping an eye on email reputation and avoiding common spam triggers in your content.

Concluding Remarks on Enhancing Email Deliverability

It takes careful attention to email content together with appropriate SMTP configuration, such as using SPF, DKIM, and DMARC records, to make sure emails sent from your ASP.NET MVC application end up in Gmail inboxes rather than spam folders. Your email deliverability can be greatly enhanced and crucial messages delivered to the right people by adhering to best practices and resolving possible difficulties in server and development settings.

Maintaining good deliverability rates can also be aided by keeping an eye on your email sending procedures and being informed about modifications to email providers' filtering algorithms. This article's tools and strategies offer a thorough approach to solving typical email delivery problems, improving the dependability and efficacy of communication within your ASP.NET MVC application.