On 01/21/2016 06:26 PM, Steffen Nurpmeso wrote:
> -r is mapped to the -f flag (talking about the S-nail fork of
> Heirloom mailx) of the MTA you use, and, e.g., sendmail says
>
>   -f should only be used by ``trusted'' users (normally root,
>   daemon, and network) or if the person you are trying to become
>   is the same as the person you are.   Otherwise,  an
>   X-Authentication-Warning  header will be added to the message.
>
> It is likely that a similar mechanism beats you.

Yes, I see this in the headers of the e-mails:

   1. svn post-commit hook using sendmail and Gmail credentials:

     X-Authentication-Warning: ###.dynamic-dns.net: www-data set sender 
to joao.m.santos.silva###gmail.com using -f

   2. mailx using sendmail:

     X-Authentication-Warning: ###.dynamic-dns.net: fidelio set sender 
to snaper###fidelio.pt using -r

(obfuscated by me)

João M. S. Silva

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