Manual Chapter : APM ActiveSync Limit

Applies To:

  • BIG-IP APM

    15.0.1, 15.0.0, 14.1.5, 14.1.4, 14.1.3, 14.1.2, 14.1.0

Updated Date: 07/07/2026

APM ActiveSync Limit

By default Access Policy Manager (APM) supports a POST body of up to 64 KB for ActiveSync. If an email body exceeds that limit, APM writes a message, ERR_NOT_SUPPORTED, to the var/log/apm log file. APM can be configured to support a POST body of up to 25 MB.

You can specify the supported size for the ActiveSync email POST body using a database variable.

Note: The maximum supported size is 25 MB.

  1. Log on to the BIG-IP system command line and type tmsh.

  2. Type this command sequence sys db.

  3. To specify the amount of disk space allocated for hosted content:

    1. Type this command sequence modify tmm.access.maxrequestbodysize value.

      This prompt displays. Values: [enter integer value min:64000 max:25000000]

    2. Type a value and press Enter.