[TriLUG] sendmail issue

[Shannon Mecklenburg via TriLUG]

Thanks Matt.  Adding an entry to the access file to REJECT the address 
and then adding the blacklist option to sendmail.mc appears to be doing 
what we want.

On 1/23/2020 1:22 PM, Matt Flyer wrote:
> I am by no means an expert on sendmail, but my first thought was that
> it may be like Postfix in that it uses an access DB file for filtering.
>   In short, you can put domains, addresses, etc and then designate them
> as accept or reject.
>
> Maybe this will work.
>
> See these two pages, especially post #13 in the second one which has
> designations for FROM: and TO:
>
> http://www.faqs.org/docs/securing/chap22sec178.html
> and
> https://www.linuxquestions.org/questions/linux-software-2/help-with-sen
> dmail-filters-for-outgoing-mail-by-sender-recipient-77695/
>
> Edit here is a third - a little more than halfway down it has some more
> examples:
> https://www.linuxweblog.com/sendmail-accessdb-example
>
> basically, create a text mapping file that has
> To:undesireable.domain        REJECT
>
> Be sure to run makemap hash command as having the .db file is not
> enough.  Whether or not you need to adjust the configuration files to
> utilize the access hash, I am not certain.
>
>
> On Thu, 2020-01-23 at 12:53 -0500, Shannon Mecklenburg via TriLUG
> wrote:
>> We run sendmail on our debian mail servers and we have an unusual
>> request.  We would like to take any emails sent to a certain
>> external
>> address and instead of attempting to deliver the email we would like
>> to
>> send it to /dev/null.  This address is in the BCC line of the
>> emails.
>> We will eventually edit all of the scripts to remove it, but in the
>> mean
>> time is there a quick method to have sendmail drop those emails?
>>
>> Thanks.
>>