いろんなフォントで「mail slot」変換
Zen Old Minchomail slot
Yusei Magicmail slot
M PLUS 1mail slot
Shippori Antiquemail slot
Yuji Maimail slot
Dela Gothic Onemail slot
DotGothic16mail slot
Train Onemail slot
Hira Minchomail slot
Potta Onemail slot
Reggae Onemail slot
Stickmail slot
Zen Kurenaidomail slot
Kosugi Marumail slot
Rampart Onemail slot
Hachi Maru Popmail slot
New Tegominmail slot
RocknRoll Onemail slot
Kaisei Decolmail slot
「mail slot」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
