Hello, How can I refuse mail from hosts who don't have an open port 25?
What do you think from such a check? Is there more needed? E.g. a list of exceptions for some big providers? Background: I've investigated why somebody did not receive mail from a virtual machine, and I found out her provider (reviced.nl) refuses all mail from a host what does not have port 25 open. I have much problems with spam and I would like to reduce it. -- Paul van der Vlis Linux systeembeheer Groningen https://www.vandervlis.nl/
