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SECURITY WARNING - possible email attack

How to modify or disable the rule Long header. Host sends emails facebookmail.com incompatible with RFC-822 and the server blocks it. Postmaster receives an email with the content:

Trapped excessively long header:
Subject: =?UTF-8?B?SmVyb21lIEphY2tzb24g?= =?UTF-8?B?KHpuYWpvbW/Fm8SHIHogdcW8?= =?UTF-8?B?eXRrb3duaWtpZW0gQW5p?= =?UTF-8?B?dGEgS3dpZWNpZcWEKSBzaw==?= =?UTF-8?B?b21lbnRvd2HFgiB6ZGrEmWM=?= =?UTF-8?B?aWUgdcW8eXRrb3duaWthIA==?= =?UTF-8?B?QW5pdGEgS3dpZS4uLg==?=

STATUS: Header truncated.

sorry for my english (translate)

Which ISPConfig version do you use?

my curent version 2.2.32