Have you looked at the Debug feature? Email Users contains a debug feature which will show the constructed email header on the Dashboard instead of actually sending the email. The purpose of this is to allow the user to examine the email header to ensure it contains the addresses one expects it to contain.
An email has three potential address headers: To, CC, BCC
Email Users uses the BCC field to send an email to multiple recipients. If you select a group or a large number of users, the email addresses of the intended recipients should appear in the BCC header field.
The only time the TO field is used in place of the BCC field is when there is only one (1) recipient. When there is on;y one (1) recipient, the address will always appear in the TO field.
When the CC sender option is used, the sender’s email address, which MAY NOT be the same as the blog admin email address, is placed in the CC field.
Because some hosts view any message without a TO recipient as spam, Email Users will always put the address of the blog admin in the TO field UNLESS the email is only going to one (1) recipient.
If you are seeing some addresses receive email but others don’t, it is possible the email is being viewed as spam. For testing purposes I use a combination of Gmail, Outlook.com, and iCloud email addresses.
The most foolproof way to ensure email sent through your WordPress site isn’t viewed as spam is to use a SMTP plugin. There are quite a few available however the only one I used personally is Wp-Mail-SMTP.
There isn’t much formal documentation other than the pages included in the WordPress plugin repository:
I am not sure why you can’t see the screenshot in this thread, it was inserted using the standard IMG button. Do you see a broken image?
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This reply was modified 7 years, 11 months ago by Mike Walsh.