I don’t know the max soap message size without using attachments, but you would not want to get close to that since the entire payload of the message would have to be resident in memory in order to process it.
MTOM is the most commonly used method of sending attachments. This approach streams the attachment rather than requiring it to be sent as part of the message body. This supports more efficient processing of the attachment. I don’t know of a size limit on a soap attachment.
HTH,
Mark
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