Hi,
we daily send thousands of mails to our clients with pdf attachment, and some of them receipt that answer :
The Symantec Email Security.cloud service detected a potential virus or unauthorized code (such as a Trojan or Phish) in an email sent to you.
This email will be quarantined for up to 30 days, and will then be destroyed.
Email Details:
Sending server IP address: 91.212.205.133
Subject: RA_14013000235201,_BC_:_LAP_-_Analyses_santé_animale,_date_rcpt_:_30/01/14
Date: Fri, 27 Jan 2017 10:51:50 +0100
Message ID: <588B1836.8020106@labofarm.com>
Virus/Unauthorized code: >>> Possible MalWare 'Exploit/IFrame-0e1f' found in '5248624_2X_PM4_EM8_MH__message.htm'. Heuristics score: 200
Email quarantined on mail server server-16.tower-188.messagelabs.com (Pen ID 78438_1485510729)
Please contact your IT Helpdesk or System Administrator for further assistance.
How can we be removed from your blocklist or recover a good reputation ? Our posts are strictly the same from years, and never contains any malware or trojan...
Can you help us ? Must I send you one of our attachments for analysis ?
Thanks.