In today's information technology, email has become one of the main popular and effective ways of communication. However, a big problem with emailing is the possibility of your email falling into the recipient's spam folder. It caused that your message to be unreadable or trustworthy. To avoid this situation, let follow the guidelines below will help you increase the chances of emails not going to the spam folder.

1. Build the correct target list
Make sure you only send emails to people who have actively signed up or agreed to receive information from you. Avoid buying email lists or collecting emails in an unreliable way. The recipient's consent is an important factor in keeping your email from being considered spam.

2. Do not use words that violate the policy
Avoid using words or phrases like “discounts,” “promotions,” “sales,” or words that violate your email service provider's policies. These words are often recognized by spam filtering systems and can cause your email to be marked as spam.

3. Avoid using too many uppercase characters
Writing an entire email in capital letters will make the recipient feel like you're "screaming" at them. This can be considered spam and reduces the chances of your email reaching the recipient's primary inbox.

4. Pay attention to email format and structure
Create emails that are clearly formatted, easy to read, and logically structured. Avoid using too many different colors or fonts, as this can reduce the professionalism of the email and make it look like spam emails.

5. Add a link to the signature
Please include contact information and a link to your official website in the email signature. This helps the recipient confirm the legitimacy and credibility of your email.

6. Check spelling and grammar
Before sending an email, make sure you check spelling and grammar thoroughly. Emails that contain too many typos may be considered spam and not be sent to the main inbox.

7. Limit the use of large attachments
If you need to send a large attachment, use an online file sharing and storage service, and then send a link to the attachment in an email. This helps prevent your email from being considered spam due to too much attachment data.

These guidelines help you send emails professionally and avoid being seen as spam. Always remember that the trustworthy and useful nature of your email content will be an important factor in increasing your email's chances of reaching your recipient's primary inbox.

8. Text and Image Percentage Optimization
Some emails contain too many images and lack textual content that could be considered spam. Optimize the ratio between text and images in your email. Not only will this help avoid spam filtering, but it will also help emails display correctly on mobile devices.

9. Avoid using shortened links
While using link shortening services like Bitly can help you monitor the effectiveness of your emails, some spam filtering systems may consider these links suspicious. Avoid using shortened links in important emails or sending commercial emails.

10. Use authentication code and DKIM . signature
Make sure your email is authenticated with an authentication code (SPF - Sender Policy Framework) and a DKIM (DomainKeys Identified Mail) signature. These methods help confirm the legitimacy of the email's source and reduce the risk of being seen as spam.

11. Offer an option to unsubscribe
Always give recipients an easy and clear unsubscribe option. This helps you comply with privacy regulations and prevents recipients from viewing your email as spam.

12. Test before sending
Before sending an email to the entire list, test the email with spam checking services to make sure the content and formatting don't cause problems that could send your email into the spam folder.

13. Follow your email service provider's policy
The top email service providers often have their own policies about sending emails. Make sure you've read and followed these rules and policies, from how to build an email list to the content and frequency of emailing.

14. Monitor stats and feedback
Use email tracking and response tools to track the effectiveness of your email campaigns. This helps you tune and optimize your email to avoid your email being seen as spam in the future.

Finally,
Sending emails professionally and avoiding the spam folder is crucial in maintaining good relationships with customers and business partners. Following these guidelines ensures that your emails not only reach the right inbox, but also increase readability and credibility in the eyes of the recipient.