How can Webflow be configured to improve mail-client-friendliness and avoid emails being marked as spam when testing form emails?

When configuring Webflow to improve mail-client-friendliness and avoid emails being marked as spam when testing form emails, there are several best practices to follow:

1. Use a custom domain and SPF/DKIM records: Setting up a custom domain for your website and configuring Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) records will help authenticate your emails, proving to mail clients that they come from a trusted source.

2. Configure reverse DNS (rDNS): Ensure that your IP address has a valid reverse DNS (rDNS) entry. This ensures that the IP address associated with your emails has a corresponding hostname, which adds credibility to your emails and decreases the chances of them being marked as spam.

3. Use a dedicated IP address: If possible, consider using a dedicated IP address for sending out your form emails. This helps isolate your email reputation from other websites, increasing the deliverability and avoiding spam issues.

4. Optimize email content: Design your email templates with clean HTML and inline CSS to ensure compatibility across different email clients. Avoid including excessive links, attachments, or special characters that may trigger spam filters.

5. Enable SMTP authentication: Instead of relying on the default Webflow email settings, you can configure your SMTP credentials to send form submissions through your own email server. This increases the trustworthiness of your emails and reduces the likelihood of being marked as spam.

6. Use a reputable email service provider: Consider using a dedicated email service provider (ESP) such as SendGrid, Mailgun, or SMTP.com to handle your form emails. These providers have built-in deliverability tools and provide dedicated IPs, which can significantly improve the chances of your emails reaching the inbox.

7. Regularly monitor and maintain email deliverability: Keep an eye on your email analytics, track open rates, click-through rates, and bounce rates. Actively manage your email lists, removing invalid email addresses, and ensuring your recipients actively engage with your emails. This ongoing monitoring and maintenance help maintain a good sender reputation and minimize the chances of your emails being marked as spam.

Remember, spam filters are continuously evolving, and it's essential to stay up to date with best practices and industry standards to maintain high deliverability rates for your form emails.