Telekom Malaysia (TM) has blocked all outbound emails sent through my mail server. According to a circular from TM to TMNet and Streamyx subscribers yesterday, this was done to thwart spammers who have caused many of TM’s IP addresses being blacklisted by anti-spam organisations. Apart from foiling spammers TM has also effectively inconvenienced TMNet and Streamyx subscribers who send out emails through our own mail servers.
I just changed the Simple Mail Transfer Protocol (SMTP) from my email server to smtp.tm.net.my and successfully sent out a few test emails to myself while maintaining my current email address on the header. This method only works if one has an active TMNet or Streamyx password and ID. This is not a long term solution though. I still prefer all outbound emails to originate from my mail server. The other option is to send all my emails through TM Net’s open relay proxy server. However, routing all outbound emails through the open relay proxy server poses security risks. Jeff Ooi’s Screenshots has more on this issue.