Question: I am getting email with partial content or corrupted attachments occasionally, and sometimes multiple copies of such email. Why?

This has something to do with the communication between mail servers (SMTP).

When the sender mail server attempted to deliver the email over to Lookafter mail server, the email delivery could fail halfway due to sudden drop on the network quality, or some interruptions in between. At this stage, the email is likely incomplete and based on usual industrial standard on discarding partial emails, should be ignored by the recipient server.

Nevertheless, Lookafter mail server will still capture these incomplete emails, and deliver to our customer account anyway. By doing this, the customer will know that the email has arrived in-time, although corrupted, and serve as an early alert on the email exchange process.
The recipient of the email, in this case, Lookafter's customer, will be likely getting copies of the same email as the sender mail server will attempt to resend the email again, sometimes over a period of 48 hours.

It is rather annoying if the email carries large attachments and recipient is getting multiple copies of it.
You can always login to the webmail via the browser, go to Email and remove the unwanted/incomplete copies of the same email quickly instead of downloading them all.

In some cases, this affects small emails too (without any attachments). When the quality of the network has degraded to a certain level, it affects emails of all sizes.
However, such issue normally would last for a day or two in general, and only affecting specific sender and logistics.

Also, since the email that you sent out is utilizing the same SMTP channel, your outgoing email gets the same “treatment” as well when your connection to the mail server is less than satisfactory.

If you do not want to receive such duplicated/partial emails, you can request your Avomaster/voadmin to turn off the “Allow Duplicate” options at Profile > Admin > SMTP settings.