I am using wifi wirelessly, and I don't think the ip address is the same because I haven't gotten a message saying that someone else has the same ip address as me. Its weird cause, I can only do certain things on the internet. The same things happen in bootcamp as well. I don't the the google server is down, because I can check my emails in gmail when I pull it up on a browser. I just can't use the app. On bootcamp, I can't play certain games online, such as battlefield. Certain things that I've tried, that don't work, say that they have trouble connecting, and that their server might be down. Or that I have connection problems. But most things work fine.
Could be your friend has restriction setting on max.
1. Go to System Preference/Network look for your IP 192.168.0.1xx or similar
2. The router will be 192.168.0.1 or similar.
3. DNS server 192.168.0.1 or 8.8.8.8. for google that gives access to Internet
Check or look below for diagnostic to ensure all green and Apply
4 Open Mail APP if using then Preference/Accounts
5. Look for your Server, mine is outlook.com on the left column
6. If none +or- section to add your mail server.
7. Follow instructions then on accounts information Click box enable this account and the bottom one for outgoing mail server.
Question what router is the main computer using Airport express base station or another company to access the internet. I think you can piggy back his mail app by via CC on the his email address.
[email protected]
CC
[email protected]
This where the complicated bit gets involved
1 Owners permission the master computer
2 Slave computer yours shared via his.
3. Setting to communicate between two computers
Hopefully a grown up can confirm using Mail App via another mac computer.
The problem might be you friend setting as mentioned previous restricting as he can create several email account via his server permission but not have a outsider using the same server piggy backing.
As you said you had no problem access via WebMail probable to with fact it goes to two servers instead of one direct server. Simple language you have the key to your house door and you can pick up the mail on the floor or letterbox. While later no key no access.
Sounds long winded being a Englishman hope this helps.