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Invalid characters in yahoo mail

suriyaehnop asked
Last Modified: 2015-05-16
We have application being deploy in development to test send an email in Thai character to customer in internet. This application use production Exchange 2007 SP3 to relay email out.

Recently, I have complain from the application owner saying that when they send a test email to yahoo account, it will show invalid Thai characters. To GMAIL, Hotmail is ok.

I had asked him to a postfix smtp (Unix box) and Exchange 2007 relay (testing environment) to relay email to yahoo, the character show just fine.

The mail flow for:

Exchange Testing env. = Application  > Hub > Edge > Internet

Postfix = Application > PostFix SMTP > Internet

Exchange production = Application > Hub >Edge > Symantec Cloud > Internet.

We suspected Symantec cloud issue, logged a case with them but they found no issue.

Kindly help
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