郵便はがき postcard. 大日本 Dai Nippon "big Japan" or "Japanese empire". 樺太 Kara Futo, Sakhalin. 大泊町 Oh Tomari Cho, literally means "big harbor town". 東 east. 三条 3rd street. 南 south. 一ノ十一 one hyphen eleven.
髙橋 Taka Hashi, family name. 久男 Hisa O, a male name. 様 polite addressing like "Sir".
北満 Hoku Man, northern Manchuria. 龍江省 a Chinese geometric name, literally means "dragon river state". 狐池(fox pond) or 狐地(fox land). ニテ means "at", he wrote this letter at the 狐池 in 龍江省 of 北満. 久友 Hisa Tomo, a male name, the writer of this letter. 満巽 Man Tatsumi, I don't know what Man Tatsumi means.
謹賀新年 A Happy New Year. 皆 everyone. すこやかに healthy. 元気 vigorous. です is (indicates present tense).
手紙 a letter. 一通 one, 通 tsu is a numerical unit (nominal measure word) for letters. を indicates object of a verb. 出しません don't write.
でした was (indicates past tense, I didn't drop a line). が but/although. 然して (shikou si te) although. 悪い bad. 心 heart.
から from. でわありません is not.
此の this. 写眞 or 写真 photo. は is/equals. 北満 northern Manchuria. - The following two characters I can't read; it is の町 "town of" - thanks Earthliŋ :-)
の of. 夕 evening. X(寒 cold) -> O(暮 sunset) - thanks Tokyo Nagoya :-)
支 China. 満 Manchuria. の of. 雪 snow.