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That's the expected behavior, you can always amend the subject line if you don't want multiples to be included.
RE:RE:RE multiple reply showing in outlook mail subject when user reply to a mail chain
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(41.6, 18%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENH%3C/text%3E%3C/svg%3E)
Nazmul Huda
76
Reputation points
RE:RE:RE multiple reply showing in outlook mail subject when user reply to a mail chain
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Outlook | Windows | Classic Outlook for Windows | For business
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(284.8, 17%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYS%3C/text%3E%3C/svg%3E)
Yuki Sun-MSFT 41,376 Reputation points Moderator2023-06-14T08:01:37.34+00:00 Hi @Nazmul Huda ，
Just checking in to see if below information was helpful. If you have any further updates on this issue, please feel free to post back.
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Vasil Michev 119.6K Reputation points MVP Volunteer Moderator2023-06-11T15:13:20.65+00:00 -
Yuki Sun-MSFT 41,376 Reputation points Moderator
2023-06-12T07:40:02.87+00:00 Hi @Nazmul Huda ，
On most occasions, Outlook will automatically strip the extra prefix like "Re:". I tried testing in my lab and as can be seen from the image below, "Re:" only appear once when I reply to the mail chain:
For your situation, does this issue affect all users in your organization? How about replying to the mail chain from OWA?
Also, you can try going to File > Options > Advanced > International options, ticking the two options below and see if it can help:
- Use English for message flag labels
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