If your group members aren’t receiving notifications of your announcement list messages, it’s likely for one of these reasons:
Is it your first time using the mailing list?
If so, check your inbox for an email asking you to confirm you wanted to send a message to the entire group. You’ll need to click the link in that email to confirm and send the message. If you don’t see the email in your main inbox, be sure to check other folders (like Spam).
Are you emailing from the right address?
Your message will only go through if you’re writing from an email address we recognize as belonging to a member of that group. We do this to prevent spam from reaching Meetup members’ inboxes. So, double-check that you’re using the email address associated with your Meetup account.
Does your email include an attachment that is too large?
Messages sent via the mailing list currently have a total size limit of 2MB. (This limit includes the message itself, plus any attachments.) If your attachment is close to 2MB, there’s a good chance the message won’t send.