Quote:
May I only change the "upload_max_filesize=5M then the webmail attachment max size is equal to 5MB.
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Keep in mind that there is always an overhead, from the email content, http headers etc, so if you want a 5M attachment, you can use upload_max_filesize=5M and a little bigger "post_max_size".
Anyway php uses the smaller of those two directives.
Regards