“The operation cannot be executed as the message has been altered.”Īny add-in might have changed the mail message whilst sending. The error code indicates virus scanner integration issue that is generally linked to script blocking.
Time-out whilst communication is going on with server.ĭetails of Errors Due to Virus Scanner Integration with Outlook. This can be identified by the error code: 8004210A. 
Operation time-out while waiting for reaction from the receiving POP server. Note - There are even many more send/receive problems that occur due to integration between Outlook and anti-virus installed on the system. Duplicate mails get created in the Inbox or other email folders. 
Inability in sending mails with large-sized attachment. Font size becomes 10 times larger than the original. Emails get sent repeatedly to receivers. HTML code gets visible in mails message. Emails get stuck in Outlook's Outbox folder. Emails get lost and sometimes undelivered. Problems Related to send/ receive Process of Emails. Some of the commonly encountered problems are related to send/ receive process of emails, time-out issues, etc. Why Disable Virus Scanner Integration with Outlook?Įnabled virus scanner integration causes a lot more issues in Outlook and so it is advised to disable it. And probably doing this renders lesser problems as far as safety and security is considered, than when the integration of virus scanner with Outlook mail program is left enabled. However, it is not so and the truth is that even after disabling virus scanner integration Outlook email client remains well-protected against viruses. Disable virus scanner integration with Outlook at the first sight it may seem that it is indeed a very dangerous attempt as it would allow viruses to attack the Outlook application and in turn endanger the stored data.
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