Ask your system administrator to synchronize Mailchimp and Sage CRM. Remove all bounced and unsubscribed email addresses from the group and resend it.

The campaign or segment details have been changed on the Mailchimp website rather than in Sage CRM and this has caused syncing issues between Mailchimp and Sage CRM. Log on to the Mailchimp website, note the current campaign and segment name, and update the campaign and segment name in Sage CRM to match them.

The notification displays the number of contacts with new or updated email addresses that were successfully sent to Mailchimp, and the number of contacts that Mailchimp couldn't process.

Ensure each contact in the group has a valid email address and hasn't unsubscribed from your campaign. The Opt out of E-Marketing checkbox on a Company, Lead, or Person record indicates whether the record has unsubscribed from a Mailchimp campaign. If necessary, remove unsubscribed contacts from the group and then click Send to Mailchimp.

Unprocessed contacts are counted as errors and included in an error group. You can click the error count in the notification to open the group and correct the contact details.

The notification displays the number of records with new or updated email addresses that are invalid or have duplicates.

Ensure each record in your group has a valid and unique email address and then resend the group to Mailchimp.

Records with invalid or duplicate emails are counted as errors and included in an error group. You can click the number of invalid or duplicate emails in the notification to open the error group and correct the email addresses.

The campaign wasn't created because you added special characters such as a backslash or quotation mark at the start of the campaign name. Remove any special characters from the start of the name and click Create Campaign.

When you're uploading several segments to Mailchimp in succession, you must wait a minute between uploading segments to ensure the previous segment isn't overwritten.