[CentOS] question on sendmail.mc file

[Jobst Schmalenbach]

Using a trap-all user may seem like a good method to prevent spammers from determining what user accounts are on a system, but will also trap legitimate mail sent to an incorrect address (e.g. via a typo on the username). I would only user a trap-all on an entire domain dedicated to the purpose.

I have always found that there are better methods to decrease spamming (e.g. grey listing, greet pause, mimedefang).

However, if you really need to you coud try

  define(`LUSER_RELAY',`local:someuser at your.domain')

Remember too, that user MUST exist!

Jobst


On Tue, May 04, 2010 at 08:18:28AM -0400, Jerry Geis (geisj at pagestation.com) wrote:
> I tried to set in sendmail.mc file at the LAST line
> define(`LUSER_RELAY', `local:unknownuser') dnl
> I did service sendmail restart and got an error on a completely 
> different line.
> -
> as a thought I deleted that line and put it on line 2 of the sendmail.mc 
> file.
> re-ran service sendmail restart and now it worked. I changed nothing else.
> 
> Is there something special about the placement of this command???
> 
> Thanks,
> 
> Jerry
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