IncrediMail always ensures that the users should not find emails boring while they communicate with their officials or to their relatives via email. This program is also user-friendly and it operates well. But sometimes users get some technical errors which are difficult to deal with.
1. Delete your Outbox folder from your Email
2. Compose each message at a time to one recipient to avoid rejection.
3. Make your inbox available to get mail, to avoid rejection from recipient’s end.
4. Mention the recipient email address correctly (should not be in Block letters)
5. If you are unable to compose emails separately, then make sure that you are mentioning limited number recipient in your ‘BBC’ list.

If the above troubleshooting fails to solve your IncrediMail Operation Incomplete Issue and if the issue continues then you need to change your account with IncrediMail.