"The middle of July in Japan is called Risshū (立秋), which is
Postcards which are sent after Risshū are called
These can be sent until mid-September.
When writing a postcard during these times it is customary to
暑中見舞い・Shochū Mimai
残暑見舞い申し上げます
at the beginning of the letter"
Source: Friends of Japan newsletter
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