Problem

Since B2bI 2025-11 AS2 content disposition header splits filenames longer than 60 characters as a best practice.
The header has this format for long filenames
filename*0=long filename over 60 characters nnnnnnnnnnnn; filename*1=nn.txt
Some remotes systems do not support this way of splitting long header values.
The old way of setting the header without spliting is described below

Resolution

Edit file ./Axway/Interchange/conf/jvmArguments.xml
Add the following in the section common to all nodes

<Property key="mail.mime.encodeparameters">false</Property>

<Property key="mail.mime.splitlongparameters">false</Property>

Restart b2bi service.