I've found this problem also since Telstra's recent changes to Bigpond. Spamhaus report the problem is that Bigpond's mail server administrators have incorrectly set their servers to run XBL (exploit block list) checks on Bigpond's autheticated clients outgoing emails. Spamhaus advise this to be improper use of their service which should only be applied to check incoming emails. Telstra should be using their own internal spam checking for outgoing emails and not Spamhaus. The problem being that if Spamhaus has blocked an IP address from a non-Telstra ISP then because Bigpond servers are wrongly applying Spamhaus XBL on their own authenticated client Bigpond customers then your outgoing email will be blocked by Bigpond's outbound server. Unfortunately I cannot get any assistance from Telstra support to have their web administrators fix their server settings to exempt their authenticated clients outgoing emails from XBL checks. Come on Telstra web administrators surely you can do better for your Bigpond customers!
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