There are a wide variety of things this could be, so any answers to this question would be speculation. Keep in mind, it’s the email that gets marked as spam (and the details of the sender, domain, etc), not the code that generates the email.
That being said, I would investigate the sender information first to make sure the headers in the email are set to show the email is sent via a valid email address with the a domain that matches the sender’s domain or is authorized to send on behalf of the domain.
You can try a testing service like MXToolbox to ensure email is being delivered successfully.
Related Posts:
- WordPress refuses to send mail, “…your host may have disabled the mail() function”
- WordPress “phpmailer_init” not working for me
- How do I override the Message-ID header of wp_mail function?
- WordPress new user / forgot password emails are broken
- wp_mail function timing out
- Why is my get_post_meta always empty
- Should I use wp_mail or PHP’s mail? [duplicate]
- Mail not sent when I set HTML headers
- Error when requesting password reset email – wp authentication
- Processing a subscription form with POST method?
- Different Webhost and using Google Mail server: Is there a better way than SMTP?
- wp_mail not sending
- Validate emails in array using foreach
- Redirect to another page after submission using wp_mail
- PHP 8, AJAX mail form to function.php doesn’t work
- How to retrieve the sender email with wp_mail()?
- wp_mail file attachment not being placed in upload folder?
- Website needs to be opened for wp_mail to work
- Notify users only on post publish
- Sending a custom form data in email through WP Mail Function
- Pass Variables or Variable Place-Holder from Editor to PHP
- Pass return-path additional parameter in wp_mail
- Send notification email to admin for every new post published
- Different SMTP based on domain
- Get page permalink in contact form
- comment_post (if comment is approved OR $comment_approved === 1) not working?
- Running SMTP Conditionally
- Including user data in “new user notification email”
- Cron not sending wp-mail()
- Premature end of script headers: wp-mail.php?
- Adding action item to admin users table and sending email
- Wp_mail doesnt work
- get_post_meta is always empty when I use wp_mail
- How to show value from ACF plugin field in e-mail?
- wp_mail vs mail functions and header arrays
- Word press – JSPDF – Sending PDF as attachment from wp_mail – Special characters
- How to include checkbox in widget backend form?
- Upgrading PHP version results in “Use of undefined constant WP_CONTENT_DIR” warning?
- How to hide get_theme_mod if field empty
- renaming an admin menu item with decimal array index number
- How to get the original price of the product in woocommerce?
- How to make sure that only one wp_cron() runs at a time?
- Fatal error: Call to undefined function wpsc_cart_item_count()
- No wp-config.php file on local install of wordpress – site still displays
- Widgets not showing in my custom theme
- Edit category output
- integrating external php library into wordpress- the right way
- To echo or not to echo?
- Different background-image by category
- How to limit the content coming from wordpress shortcodes?
- What is the fastest way to load PHP functions that are only used in one theme template?
- Writing scripts using WordPress / WooCommerce classes?
- storing wp_head in a variable?
- Change description on specific WooCommerce product status change
- How do I attach a php file to an arbitrary slug and still have access to the wp-core functions?
- Woocommerce redirect thankyou page based on product ID doesn’t empty Cart
- Creating own shortcode – echoeing php variable based on JS variable
- Error: options page not found
- Filtering a Database Query
- anyway to put inside a $outprint=sprintf()
- Can’t save php string to a custom field
- Appended comments but they show up above the content instead of below
- get_template_directory adding FTP root folders in urls
- What’s the best way to include PHP code in pages?
- Is there any wordpress plugin to upload images and captions to multiple pages once
- Line breaks inside shortcode variable
- Site Health says I’m running an older version of PHP even after I upgraded to 7.4.4
- WordPress REST API register_rest_route give a 500 error
- Where to insert redirect code based on http_referer?
- Override Admin menu icon
- Trying to get property of non-object in WordPress Breadcrumbs
- How can i make a search box to search by custom field
- go to home page when i select default in select-box
- Database entry removed on browser refresh, Ajax PHP jQuery
- wp_Query with mutuplea values returns all posts
- How to stop hiding buttons forward / backward in pagination?
- Add to cart quantity dynamic
- Infinite looping next post link within a certain category on a post
- Limit content size by character or word in database
- String replace for Login/Logout concatenation problem in menu
- PHP call_user_func_array() error
- Redirect after login depending on the URL
- Customizer: How to Sanitize a Decimal Number Range
- Displaying POST content with HTML tags and all
- WordPress 3.0 PHP Error – notice WordPress_product_Type was called incorrectly
- Retrieving specific images from Media Library
- Notice: Undefined index: fix with isset [closed]
- Include administrator in author list
- Pass php to database in JQuery: With AJAX?
- List sibling pages widget, exclude current page
- Path for contact form file
- File Upload with Server in safe_mode
- WP plugin updates [duplicate]
- Custom Archive Page
- Load files content [closed]
- Shortcode for Visual Composer Grid fails turning string to integer
- How do I do so that people can register on my wordpress site?
- Custom taxonomy pagination shows 404
- duplicating page templates
- Upload multiple files via ajax from an HTML file input