Hi Howtoforge community, I'm searching for help about a postfix configuration cause i'm blocked, we have a postfix mail_version = 2.11.3 and i'm looking for how to reject/block mailtester.com or others for testing our server about email existence our server shows (E-mail address is valid) we wanna block this function like Gmail(Server doesn't allow e-mail address verification) or others. Thanks in advance. Samuel.
Blocking should go same way as any blocking with Postfix. There is reject_rbl_client for example, or read postfix docs for other reject directives if you do not want to set up you own RBL. Or use Internet Search Engines with Code: postfix block specific IP
Thank you Taleman for your answer & time but this is not the solution that i'm looking for, i think you didn't understand my question.
Are you sure? Version 2.11.3 is from October 19, 2014 (!!) There is much more to worry about your mail server... The option you are looking for is in Address verification http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient However, most options are not available in your postfix version.
