UPDATE
The second point from the above message is wrong (it is about other plugin). Sorry!
The received message/error I described above is strange, because I sent the same email message from my Gmail account to the same email addresses list (with a copy/paste from Email Users plugin) without any problem!
Regarding question #1, it used to be possible for multiple WordPress user accounts to have the same email address. It wasn’t recommended but it was possible. WordPress now checks for duplicate email addresses but I am not sure when that was introduced.
- Do you know for sure the 15 users have unique email addresses?
- Do you know for sure that all 15 users are set to receive bulk mail? If you selected a group which has 15 users but one of the members does not accept bulk email, that user will be removed from the recipient list.
I’d start by looking at those two things and see if anything pops out. After that, I’d enable debugging so you can look at the constructed mail header to see which address is being dropped as it may lead you to what is different about that user.
1. Yes, all 15 users have unique email addresses.
2. Yes, all 15 users are set to receive bulk mail.
I enabled debugging. Now, if I enable the “Exclude sender from email recipient list” the plugin will send an email to all 15 users, including me!, with the message “Email has been sent to 14 users, but 15 recipients were originally found. Perhaps some users don’t have valid email addresses?”. If I disable the “Exclude sender from email recipient list” the plugin will send an email again to all 15 users, including me, without that error message, but with “Email sent to 14 user(s)” (why not to 15 users?).
I send emails from “Send to Groups(s)”. And I am a member of the recipient group. Sending emails from “Send to User(s)” seems to be OK.
Is your email address the same as the site admin’s email address?
Are you selecting a single group or multiple groups?
When composing an email the list of recipients can contain duplicate recipients because a WordPress user can frequently be a member of more than one group. When the email header is constructed one of the last things which happens is the list of recipients is traversed to ensure it doesn’t contain any duplicates.
It is possible for the number of email messages sent to be less than the number of recipients when multiple groups are selected because the “uniquification” process of flushing out the recipient list is not passed back up the call stack.
I have only one account and two roles (Administrator and a second one), so the email address is only one.
I selecting multiple groups, but I am a member only in one group.
So, the error message (or maybe attention message) I received is not a big problem? Apparently, the email message was sent to all users from all selected groups.
No, the message is very much informational. It just lets you know that for some reason, an email address was optimized out of the recipient list. In some cases it may be an issue you want to investigate but it doesn’t necessarily mean there is a problem.
OK, thank you! I’ll pay attention for how the plugin will behave in future situations, but for now I will mark this topic as resolved.
