Enterprise Software Thread, Hotmail blocking emails from our Exchange box since swapping to new IP in Technical; Hi all
Hoping someone might be able to help. Our Exchange 2010 box has been running OK for some time. ...
Hotmail blocking emails from our Exchange box since swapping to new IP
Hoping someone might be able to help. Our Exchange 2010 box has been running OK for some time. On Friday we went live with our new leased line (which obviously meant swapping IP addresses). Domain and MX records etc, all swapped at ISP, and all working fine. Emails send out and are received. Everyone can happily log in to OWA from outside.
One problem though, since the swap, we haven't been able to send emails to Hotmail/Outlook.com accounts. Have had a look at https://postmaster.live.com/snds/ and it is showing our new IP as blocked due to email harvesting.
As far as I can tell there is no spam being relayed by our server, and it seems odd that we weren't blocked before the IP change. Checked HELO which seems fine. Were not listed on any Blacklist sites etc. As far as I can DNS and Reverse DNS are all fine. The only contact there seems to be to find out why this has happened is the online form at https://support.msn.com/eform.aspx?p...bl2&ct=eformts which just sends me back an email saying:
More information needed
xx.xx.xx.xxx (our IP address)
There are indications that the above IP(s) are engaged in namespace mining. Outlook.com is blocking all email sent from this IP.
and tells us to correct the problem and you must stop the behavior described above.
Not a lot of help and no information to go on really.
have you had a look at MX toolbox for blacklisting?
We had a random one like this the other day and we just emailed in and said who we were and explained that we had swapped IP's last summer and the IP we had swapped to was recycled and that we would pretty please like them to stop blocking us. The block was gone in 24hrs.