We receive the message "receiveing aborted"

[fernandovargas1]

Hello everyone, since a few days we have been received the following error message in our logs.

26 May 2014 12:16:03 (GMT -05:00) Protocol SMTP interface Data 1 (IP x.x.x.x) on incoming connection (ICID 69032804) from sender IP
200.16.40.21. Reverse DNS host mail.abc.com verified yes.
26 May 2014 12:16:03 (GMT -05:00) (ICID 69032804) ACCEPT sender group WHITELIST match 200.16.40.21 SBRS 5.6
26 May 2014 12:16:03 (GMT -05:00) Start message 37232867 on incoming connection (ICID 69032804).
26 May 2014 12:16:03 (GMT -05:00) Message 37232867 enqueued on incoming connection (ICID 69032804) from juan@abc.com
26 May 2014 12:16:03 (GMT -05:00) Message 37232867 on incoming connection (ICID 69032804) added recipient (pedro@cd.com).
26 May 2014 12:28:23 (GMT -05:00) Incoming connection (ICID 69032804) lost.
26 May 2014 12:28:23 (GMT -05:00) Message 37232867 aborted: Receiving aborted 

This error only affects emails with an attachment, empty emails pass ok, do you have any idea of what we need to verify?

Thanks for your help

[Stephan Bayer]

Is SBRS score checking enabled on the mail flow policy that is linked to sender group WHITELIST?

Do you have any message filters with an action of drop? CLI> filters command...