We need mailboxes in our ships

You might be in deep space doing battles, the time you see the planets are in dominance because of the time abstraction. It's not logical to get steady delivery into a mailbox inside your ship, because you're supposed to be moving around when in a ship.

That the game abstract the time you see certain planets more than the hyperspace sequence, or the occasional space battle, does not mean you're automatically available at all times for a steady delivery of physical items, into a certain object in the ship.

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I fail to see how compressing the time it takes to travel to the space station to pick up mail (which could be done by just clicking on the door to land, this simply avoids the loading screen) is any way less logical than allowing our companions to take your ship (while you're on it, possibly even doing a space battle) to simultaneously travel to 4 different corners of the galaxy to collect items for you.

Honestly, assuming that you docked to pick up the mail, and just never had to bother directly performing the action seems far MORE logical than allowing companions to take your ship to five different places at once while you're sitting on it. If you're ok with multiple weeks of travel to five different locations happening at the same time while you're sitting on the ship that your companions would have to borrow, why is picking up mail from the nearby space station without having to click on the door an issue?

Possible and plausible is two different beasts altogether. The latter is largely ignored for some reason.

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bioware already use it in ME2, is e-mail so hard to imagine?

of course its plausable, you fool. You just choose it not to be. Like I said, lack of imagination. The way you insist to think inside the box is a perfect example.

I kinda feel sorry for you.