> On 20 April 2018, at 01:30, Karel <postfix-us...@vcomp.ch> wrote: > > Hello, > > is it legitimate to use "To: undisclosed-recipients", or is to only > (mainly) used by spammers ? > > Seems to me, if I get an email, I should also know who else was the > email sent to. > Its like having a conference call and you don't know who's participating. > > If I wanted to block emails without any recipient, what would be the > best way to do it ?
One good use of that is to prevent spam. If you are sending an email to a number of people (announcements etc.) then the normal response is for people to reply-all. That spams a lot of people who don't want to see those, or don't want their email address published. By using BCCs, you avoid both issues. -- Doug
