Hi, my server on Debian with ispconfig 3 can not sent mails with roundcube thats running under ispconfig. I can get incoming mails in Roundcube but can not sending mails. My ISP is blocking port 25, so what should i do so i can use port 587? And is it nessesary to use relayhost in server config /mail ? Should i open in ispconfig port 578 in the firewall? Should i make some adjustments in the file master.cf? Can someone explain me what to do for sending mails with Roundcube Kind Regards Robin
If you have an external mail server or use an external mail service, you could relay to them (on a port other than 25). If not, and you want your machine to deliver mail directly to remote servers, then you must have port 25 open.
