Add your subnets to mynetworks in main.cf
example:
mynetworks = 127.0.0.0/8, 192.168.1.0/24
Then they should be able to send e-mail without authenticating.
Add your subnets to mynetworks in main.cf
example:
mynetworks = 127.0.0.0/8, 192.168.1.0/24
Then they should be able to send e-mail without authenticating.