need to send mail through exchange server but isp blocks outbound port 25
Posted on 2008-06-18
i was an attglobal dsl cutomer with an exchange server on the inside sending and recieving mail. one day we switched over to cable and kept the att dsl line for a backup in case cable ever failed. when i switched to cable i saved the firewall config file for the dsl line, and the changes i made were only to our public ip address. i also changed dns info on my server. switched the cable and everything worked fine! recently our cable line went down and i switched back to the dsl. upped the old dsl config file changed the dns ionfo on the server switche dth eline and internet came up and incomming mail started flowing. only thing is i could send any mail out. i can not figure out for the life of me why mail will not leave my org. it sits in the exchange queu. there are not smtp relays on the exchange server and everything worked fine before. please let me know if there is anymor einfo i could provide.