Define the list of allowed attachment mimetypes. By default, this list is empty, but you can specify a comma-separated list of allowed mimetypes. Note that a joker (*) can be used to accept any media type. Once this list is not empty, any attachment with an unlisted mimetype will be rejected. For instance, if you want to only accept plain text and any kind of images, you can set the list to: text/plain,image/*
Define the list of allowed attachment mimetypes. By default, this list is empty, but you can specify a comma-separated list of allowed mimetypes. Note that a joker (*) can be used to accept any media type. Once this list is not empty, any attachment with an unlisted mimetype will be rejected. For instance, if you want to only accept plain text and any kind of images, you can set the list to: text/plain,image/*
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