You are probably using the email like this: 
  $email="address@host.name.com" ;

[download]
In this case, perl interprets "@host" as access to an array, which you probably don't have, so it is empty.

Using strict and warnings would help in this case.

To resolve, use single-quotes (perl does not interpolate the contents).

     Syntactic sugar causes cancer of the semicolon.        --Alan Perlis

In reply to Re: reply-to address being truncated by NetWallah
in thread reply-to address being truncated by fionbarr

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