In this post, how to Increase MDaemon WorldClient Attachment Size. By default, the maximum attachment size of MDaemon mail server is 25MB.
![Bg844](https://bonguides-1e199.kxcdn.com/wp-content/uploads/2022/06/bg844.png)
1. On the mail server, go to this location C:\MDaemon\WorldClient\
2. Open the file Domains.ini using a text editor.
![Bg845](https://bonguides-1e199.kxcdn.com/wp-content/uploads/2022/06/bg845.png)
3. Search MaxAttachmentSize.
![Bg846](https://bonguides-1e199.kxcdn.com/wp-content/uploads/2022/06/bg846.png)
4. Change MaxAttachmentSize and MaxComposeAttachmentSize to any values as you need. Please note values are in KB.
![Bg847](https://bonguides-1e199.kxcdn.com/wp-content/uploads/2022/06/bg847.png)
5. Stop then restart MDaemon service then compose a new email to verify it works.
![Bg848](https://bonguides-1e199.kxcdn.com/wp-content/uploads/2022/06/bg848.png)
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