On 2022-01-13 04:18, Richard wrote:
The quick answer is that it depends on whether your ISP has port 25 open (both in an outbound). With consumer-grade connectivity it's generally not, so the type of connectivity that you have will impact this. Your terms of service may also legally preclude this, but that's an issue to be considered elsewhere.
yes, but there is no sense to block incomming port 25 with static ip, it can be blocked on dunamic ip, but are seldom on static, hope it make sense, if port 25 is blocked on static ip for the outgoing connection most isp will open it on regest, but would at same time ask for the ptr reverse dns to add, do not just use default ptr if sending mail direct to mx recipients
