Disappearing email

Ok real issue here. Have email domain at BT email then POP'd to exchange on 2008 sbs using the pop3 connector.  Email working ok apart from a few companies. So 1st test. Emailed user to reply and it comes through ok. Test 2 - user creates new email no attachment it came through ok. Test 3 - email generated via sage with PDF attachment reaches BT server and can be viewed using BT Outlook.com web mail but when the pop 3 connector connects it disappears.  Never reaches exchange.  Ran message tracking on the server and there is no sign of the email.  Any ideas...  Have switch off AV but made no difference.
CruthinAsked:
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CruthinConnect With a Mentor Author Commented:
Ok have it solved.  Email consisted of only a PDF attachment.  No subject and no contents in the body of the email.  Once I switched off the anti spam email delivered ok.  It was being rejected by the contect filtering as the falling below the SCL of 7 and was automatically rejected.
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Ahmed HusseinCommented:
Make sure that the SBS settings allow large attachements files, the default setting for SBS attachement file size is 10MB try to raise that up, and try again.

~AG
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CruthinAuthor Commented:
Good thought but attachement is only 43kb. Also already have the attachment size increased to 30Mb.  When they send a copy invoice via direct mail it comes through but when generated by sage it only gets as far as BT server before it disappears. Am going to switch off spam filter in exchange and see if this makes any difference.
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CruthinAuthor Commented:
Cos I fixed it.
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