hi. (with regards to the version number of sendmail, i believe i typed it correctly but just to be clear, it is the sendmail that comes by default with redhat 8.) i'm trying to get sendmail working on a redhat 8 box i just installed. so far i am able to send emails, but i cannot receive emails. connections to port 25 are refused. 1. service iptables stop, does not allow access. 2. even adding a dnl in front of a specific line (that i cannot remember right now) in /etc/mail/sendmail.mc does not help. (yes i know i have to rebuild the sendmail.cf and restart the services. i even confirmed the absence of the generated line in sendmail.cf after the rebuild.) this "fix" according to quite a few documents should do the trick when it comes to this "connection refused" issue with redhat 7.1 and greater. (iirc) i can telnet 127.0.0.1 25 and gain access, but not from another box, or to (by "to" i mean the boxes external ip address) any other ip address. as well, i can send email using pine to chris at localhost but not from or to any other address (except those ending in @localhost). any ideas? what else should i check? btw, i have not created a /etc/mail/relay-domains file, or an access file because i assumed those only dealt with relay permissions and that is not my intent right now. so i didn't want to mess with them since i am new to linux. i will appreciate any documents/resources/comments/ideas you have. thanks, chris.