| Event Id | 1215 |
| Source | MSExchangeMTA |
| Description | An interoperability error occurred with entity <object name>. Session error: bad concatenation of session protocol data units (SPDU). The string is too long. Control block index <index name>. [<value> <value> <value> <value>] (14) |
| Event Information | The diagnostics logging levels of the message transfer agent (MTA) Interface and Interoperability categories should be increased to create interoperability logs.These logs are text logs that consist of the binary contents of communication among MTAs in different sites and between MTA and client applications within a site. |
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