Sometimes (not always) Outlook removes [EXTERNAL] from the Subject line after I hit Reply\Forward\Reply All

  • Thread starter Thread starter Jack Leidu
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Jack Leidu

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I don't know if this is an Outlook "issue" (we use Office 2016), but I am stumped. I know this issue is not caused by a Transport or Outlook rule. It only happens with some customers we deal with, not everyone. We are in a Hybrid environment with all mailboxes in O365. We use a device to put [EXTERNAL] in the Subject line for email form the outside, works great. I will get a response to an email that I sent a customer (this happens to all of us, not just me). It will have [EXTERNAL] in the Subject line, which it should. If I open it up and select Reply (or Forward\Reply All) the [EXTERNAL] is missing from the Subject line (the other text is present in the Subject line). All I've done is opened it up and hit Reply....I haven't sent it. It does it in the desktop Outlook app and in web mail. We only have 2 email admins, we've not touched the Exchange box or anything in O365. Everything on the Internet I've read about says to check Transport rules and or Outlook rules. I've done that even though this is not always type situation. It will always do it for the same customers, but not always for everyone. I'd be curious if anyone has some insight on this.

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