Reread. I don't not block port 25. I assure you, OVH has been used for C&C by hackers. Angler comes to mind.
Original Message From: Dominic Raferd Sent: Tuesday, January 3, 2017 11:42 PM To: postfix-users@postfix.org; li...@lazygranch.com Subject: Re: Rate-limiting access to postfix on the firewall, what are decent numbers (depending on overall traffic)? On 4 January 2017 at 02:16, < li...@lazygranch.com> wrote: > > http://bgp.he.net/AS16276#_prefixes > I'd switch to 587 and block everything OVH. Actually I do just that since OVH > is on my Web Access blocking list, which I also use to block all mail ports > other than 25. > > OVH VPS are often used by hackers. I think they are as low as $3 a month. This is rash; we use OVH and we are not spammers - we need a static ip (as it is not offered by our ISP) and they provide one at a good price. You risk blocking genuine emails - this one included (except you may receive it via the list mailserver).
