Dymanic ISP IP addresses and SPAM filtering
Posted: 08 Dec 2009, 15:40
Hi guys
Just had a irritating two days trying to figure out something:
Friday, ADSL goes down and red "internet" light appears on ADSL router. Call telkom, who announce local exchange has issues.
Reboot router, red light stays on, but internet now seems to work fine. However, suddenly can't send emails, all bounce back with errors of all descriptions. Phone syncing with exchange server stops working. Decide to wait on telkom...
Monday moring, same light on modem. Call Telkom who announce nothing wrong with exchange. reboot router. Red light goes out, but internet connection dies. Reboot netgear GT834 again, red light appears on again, but full internet access returns.
Phone syncing with exchange server erratic on and off
Checking through email error messages, I see that the recipeint mail server is blocking the mails. WTF? Why suddenly?
It seems that when I reset the router, IS assigned us an IP address that is blocked by the majority or spam monitoring sites around the world.
Tuesday, turn off modem for an hour in hope of getting a different dynamic IP address. On reconnection, different IP address!! Email sending now ok, but active sync with phones still very erratic, and some phones don't connect at all. Red light on modem still on...
Firstly, from what I hear, most dynamic IP addresses are blocked by spam sites which is why we use a trusted intermediary like Mail Marshall or the ISP SMTP server to send. So why does did the emails bounce int he first place? They bounced with the IP address of the IP asigned by IS, NOT the Mail Marshall IP, so it seems the spam filters are reading through all the headers now??
Second, any ideas what gives with the active sync? is there a way I can check the server to find if the phones are getting through at all?
Thanks guys
Just had a irritating two days trying to figure out something:
Friday, ADSL goes down and red "internet" light appears on ADSL router. Call telkom, who announce local exchange has issues.
Reboot router, red light stays on, but internet now seems to work fine. However, suddenly can't send emails, all bounce back with errors of all descriptions. Phone syncing with exchange server stops working. Decide to wait on telkom...
Monday moring, same light on modem. Call Telkom who announce nothing wrong with exchange. reboot router. Red light goes out, but internet connection dies. Reboot netgear GT834 again, red light appears on again, but full internet access returns.
Phone syncing with exchange server erratic on and off
Checking through email error messages, I see that the recipeint mail server is blocking the mails. WTF? Why suddenly?
It seems that when I reset the router, IS assigned us an IP address that is blocked by the majority or spam monitoring sites around the world.
Tuesday, turn off modem for an hour in hope of getting a different dynamic IP address. On reconnection, different IP address!! Email sending now ok, but active sync with phones still very erratic, and some phones don't connect at all. Red light on modem still on...
Firstly, from what I hear, most dynamic IP addresses are blocked by spam sites which is why we use a trusted intermediary like Mail Marshall or the ISP SMTP server to send. So why does did the emails bounce int he first place? They bounced with the IP address of the IP asigned by IS, NOT the Mail Marshall IP, so it seems the spam filters are reading through all the headers now??
Second, any ideas what gives with the active sync? is there a way I can check the server to find if the phones are getting through at all?
Thanks guys