The most common reason subscribers don't see your email in their inboxes is because it's landing in spam folders. If your recipients have checked their spam or junk folders, though, there are a few more things to check:
- Is a particular subscriber not getting your emails? Ask them to add your "reply-to" address to their contact list or address book.
- If your reply-to email address is in their address book, have them check their spam filter settings or configuration to be sure that your content and/or address isn't being blocked.
- Are they using a webmail provider such as AOL, Yahoo, or Hotmail? These providers deliver mail in small batches which can sometimes result in emails taking up to 24 hours to be delivered to the particular email account.
- Has the campaign actually been sent? It's possible the campaign is still in the delivery queue for sending from our servers. To check on the status of a campaign, head to the Campaigns page in the account. Check the status column. It will show "Sent" once the emails have been sent from our servers. If it shows "Sending" then it's still being processed by our servers for delivery to your list. Wait a few minutes and refresh the page to update the status.
- Have you run into problems with internal firewalls? Some domains don't like seeing emails going to and from the same domain, while being passed through a third party. For instance, you may be sending an internal company newsletter from firstname.lastname@example.org to email@example.com. In the middle of that process, your email goes through a MailChimp server. Some domains find emails like this suspicious and block them. We find this problem occurs mostly with corporate and university filters. You'll need to review the whitelisting information below if you're seeing internal emails getting blocked.
If none of the above seem to get your emails to subscribers, they may need to add our IP addresses to their whitelist. Generally, only corporate domains can do this. Consumer ISPs won't add IP addresses to their whitelists on a case-by-case basis (we work with consumer ISPs in other ways, though, to help ensure that our servers can deliver mail to them). Typically, subscribers will want to have their server administrator or IT department handle whitelisting MailChimp's servers.