in reply to Re^2: email subject issue in mailx
in thread email subject issue in mailx

In addition to issues identified by almut, 
'manjunath.bm\@alcatel-lucent.com mbm\@alcatel-lucent.com'

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produces the string 
manjunath.bm\@alcatel-lucent.com mbm\@alcatel-lucent.com

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You want 
'manjunath.bm@alcatel-lucent.com mbm@alcatel-lucent.com'

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or 
"manjunath.bm\@alcatel-lucent.com mbm\@alcatel-lucent.com"

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