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This works:

echo "yada yada" | msmtp my@mail.com

but not this:

cat yadayada.txt | msmtp my@mail.com

which delivers the email with empty content.

Why does echo work through pipe but not cat with msmtp ?

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Is your yadayada.txt formatted funny or have weird permissions? It works fine for me catting it out. – nerdwaller Aug 7 '13 at 21:52
    
yadayada.txt has u:rw g:rw o:r and is a multiline file. sample content: === rsync start === 2013-08-07 20:58:01 === rsync stop === 2013-08-07 21:00:50 – user19496 Aug 7 '13 at 21:56
    
this worked: tr -d ':' < yadayada.txt | msmtp my@mail.com – user19496 Aug 7 '13 at 22:26
    
':' was the culprit. thx @nerdwaller you pointed me in the right direction. – user19496 Aug 7 '13 at 22:27
    
That makes sense, since msmtp allows uses of something like Subject: My subject line. Good catch! – nerdwaller Aug 7 '13 at 22:32

msmtp seems to rely on a wellformed email message in the file being read.

Ex.

Subject: My subject line  
My body text

Since I don't care about Subject etc
(I'm sending an email when a logfile is modified using incron)

tr -d ':' < yadayada.txt | msmtp my@mail.com

is a Q&D way to get the logfile content sent using msmtp.

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