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[External] Added to Email Subject Line on Reply?

Occasionally I will receive a reply to an email with a normal subject line (ex. Subject: Experts Exchange) and [External] will be added to the subject line (ex. Subject: [External] Experts Exchange)

When this happens there are normally multiple people on the chain and I have seen it on reply's from within my domain so the obvious thought of an external sender got cancelled out.

I use Google Apps for business and send email to other Google Apps and Exchange users, it doesnt seem to be biased to a specific email platform. Google searches didnt turn up much. If you look at the email messages posted in this forum you will see that it happened to this person as well. Totally unrelated forum and domain, just randomly found this on google.
http://www.coe.org/p/fo/et/thread=27567
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Sparcedge
Asked:
Sparcedge
1 Solution
 
dan_blagutCommented:
Hello

It looks like Antispam filter tagging. but I dont know at what level.
Do you use an antispam -antivirus filter on Exchange / Google Apps?

Dan
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SeanSystem EngineerCommented:
I agree it could be antispam tag or it could even be a transport rule but if it only happens some times then i would say it would be something with spam filtering.
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SparcedgeAuthor Commented:
Ill take a look at one of the headers and see if I see a trend in the type of Spam filtering being used on impacted replies.
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David AtkinTechnical DirectorCommented:
May also be worth checking your Anti-Virus to see if that is tagging it as well.
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SparcedgeAuthor Commented:
We use google apps for business, I have not seen a header where it suggested google added the tag. Im having trouble getting headers from external email addresses, will report back as soon as I have something.
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SparcedgeAuthor Commented:
It was a external sender that we were sending to, they recently enabled a change in their spam filter to label all mail from outside their domain as EXTERNAL. It was in hopes that people would stop opening external emails that contain viruses. So all replies from their domain add EXTERNAL to the subject.
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