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You have not used -i in sendmail'ssendmail's command line options.
-i
sendmail
It makes sendmail treatWithout it, sendmail treats a "single dot only line" as end of message.
You have not used -i in sendmail's command line options.
It makes sendmail treat "single dot only line" as end of message.
Without it, sendmail treats a "single dot only line" as end of message.