Hi - need some help and advice on a problem that's proving hard to solve.
Have been sending emails from an iPhone and a PC [using Outlook 2016] via mobile broadband. Use a data SIM. A number of those emails [some to clients] are not being delivered.
There's no clear pattern to those that are and aren't delivered. Failed delivery could be to addresses at a commercial/business domain - or it could be **Personal info**.
The best explanation I can find is that the O2 IP is being flagged on a blacklist as a generator of SPAM. Using Spamhaus and feeding in the O2 IP - shows it up as 'flagged' on a number of blacklists.
If I reboot the phone [or the router] and get a new IP asigned - this inevitably has the same problem.
All the IPs I've had asigned are in the 82.13.XXX.XXX range.
We've checked ALL our settings and all of the tech - but no joy. We've had long convesrations with our domain host about whether it's an issue at their end - and they've investigated extensively.
In comparison - if I send the same email to the same address using BT Broadband - the email gets through.
Frankly it's driving me completely nuts. Any thoughts? Anyone else had the same issues?
It's a known issue that has been reported already.
@O2Emma is looking into it for us.
No worries @bunzena
Keep your eye on this thread https://community.o2.co.uk/t5/My-O2/ip-address-blacklist/td-p/1409395