I was supposed to get an email for my future job and it didn't show up anywhere.
What should I do to make sure that I get it tommorow when they send it again to me? I added firstname.lastname@example.org to safe senders and also x.x (without the @ and stuff before it). But so far that's the only thing that I can do :S
It kind of depends on why it did not make it to you the last time.
The most common reason would be it was caught by a spam filter. Typically, if you are using a browser based email (i.e. Gmail, Hotmail, etc), then it will be a server based spam filter and typically those servers will put messages that it considers to be spam in either a spam folder or junk folder unless you change the settings (some allow you to immediately delete messages labeled as spam rather than put them in a spam or junk folder, but this is typically NOT the default setting). So, if this was the reason why it did not show up in your inbox, then it should likely be in a spam or junk folder in your account (i.e. you should still be able to find it in your account). If it is not, then it tends to suggest that it did not make it to you for another reason. If a spam filter was the reason, then you did what at least one item help prevent that by adding a safe sender. The other thing would be to check the spam filter settings to make sure it is not set to just delete messages labeled as spam.
The other potential reason would be if the sender mistyped the email address when sending the message. If this was the case, there is nothing on your end to "fix" this other than to potentially simplify your email address if it is complex (i.e. maybe setup another email account with a simple address on GMail).
I will note that setting up an email client will likely not help. If it is not showing up in an online inbox accessed by way of a browser, then it likely will not show up in an email client. The email client still has to get the email message from the email account's server, which is what is serving up the inbox through the browser. So, you are just adding another layer to the same system. So, if the problem is with your email provider's system/server or on the sender's end, then using an email client will not change a thing.
To me, your best option would be to setup another email account on another service (such as Gmail as it is free and it look like you are currently using Hotmail) and have them send the email to both your old account and new account.