Best Practices To Avoid Spam Filters

Avoid Interactive Content

Some kinds of interactive content can cause your emails to be marked as spam. Including the following in your email code sometimes triggers spam filters:

• JavaScript
• RSS feeds
• Forms

Keep Your Code Clean

Copying HTML from a word processor, such as Microsoft Word, into Account Engagement adds style tags and other code that can cause rendering issues. When copying HTML content, first paste it into a text editor, such as Notepad, and remove all formatting. To add formatting back, copy the unformatted text into the editor in Account Engagement.

Keep the Image-to-Text Ratio Low

Too many images or too large of an image compared to the amount of text in an HTML email can make your message look like spam to a filter. Adding more text and reducing the number and size of images can help.

Some email clients block images by default, so your recipients don’t see the images automatically. Include alt tags that describe your images in case they don’t load for the recipient.

Be Careful with Links

Avoid using URL shorteners in your emails. Spammers frequently abuse them, and some shortened domains have been placed on widely used block lists. Many spam filters block emails that contain shortened links from shortened domains.

Most spam filters consider emails with links to several domains spammy, so limit the number of different domains that you link to in an email.

Include the Physical Address and a Way to Opt Out

Marketing emails must contain two things: your physical address and a way for recipients to opt out of future emails. If your marketing emails are missing an unsubscribe or email preference center link or a physical address, they can trigger spam filters. However, email templates include an unsubscribe link in the footer, so don’t worry about adding this information.