Internet Information Services
Microsoft web server software.
1,679 questions
Disable default IIS STMP email header
![](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(278.4, 87%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYR%3C/text%3E%3C/svg%3E)
Yehuda Ringler
1
Reputation point
We're trying to set a custom Return-Path header (we use mail kit), and when the raw email content is written to a file, the Return-Path header is set correctly.
And when it's sent for real from IIS, our custom Return-Path header is still there... but there's a second Return-Path header!
It seems that IIS is adding an additional Return-Path header, ignoring what was already there.
Has anyone else experienced this? What did you do about it?
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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(3.2, 24%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESW%3C/text%3E%3C/svg%3E)
Sam Wu-MSFT 7,526 Reputation points Microsoft Vendor2021-07-26T03:06:42.137+00:00 @Yehuda Ringler As far as I know, it is impossible to disable IIS STMP email header in iis, i suggest you try to figure out why these two Return-Path headers appear, and what is the difference between them.
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