How to Disable Chunking Support on the MTA Server (Doc ID 2037859.1)

Last updated on MAY 05, 2021

Applies to:

Goal

We occasionally see mail coming in from a certain ISP fail with the following in mail.log_current:

The only happens when remote MTA is using BDAT and only when there are multiple recipients on the message.

Further investigation is required to determine the cause of the problem.

The receiving MTA was on patch 7.0.4.24.0. A few bugs related to BDAT were fixed in more recent patches. So the first action should be to upgrade to the current patch level.

But it is also possible that a firewall or other intermediate device is interfering with the connection.

Packet capture and analysis at the TCP level would be required to determine what is causing the problem.

But to workaround the problem, you could disable BDAT support.

Solution

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