I’m a long term Optus customer. Today received ‘Undelivered Mail Returned to Sender’ message when I sent a legitimate email to a legitimate and often used external business email address. Gist of the message is that the receiving server has an Optus IP address marked as blocked! It is 184.108.40.206
So Optus is reporting to me that one of its own IP addresses is blocked! Delivery report:
Final-Recipient: rfc822; email@example.com
Remote-MTA: dns; mail.lungfoundation.com.au
Diagnostic-Code: smtp; 550-delivery from 220.127.116.11 is rejected. Check at
Reference 550 code:tid=0001.0A150301.5A507350.0042
Does anyone know for sure how to do this please?
Solved! Solved: Go to Solution.
Squinting in rhe sun here looking at that error message I do beilieve the recipient has rejected that email not Optus. I must say it's not uncommon for an internet service provider to have their mail server blocked and there can be numerous reasons for that. When I check the Optus mail server IP against a popular block list tool it shows 2 different mail filters have blocked that Optus mail server IP.
Often just restarting your modem or device or waiting for a short period of time you will end up using a different mail server so the problem will resolve itself. In the event that you get stuck on the same mail server you may need to contact support to make them aware of the problem.
When I looked up that link that was in the delivery failure report, it identified the IP address was blocked by the recipient’s Mail Server which is running Cyren mail software, and I found that Cyren mail software has the Optus IP address marked as High Risk!
I’ll restart the modem and cross fingers. If that doesn’t work, do you have any suggestion on how I can contact Optus Support without going into their endless phone queue?
I don't know of any shortcuts around the overwhelmed support system unfortunately. Should you run into a problems you may need to send email to that recipient via another email address.