The “f” in http://us.f348.mail.yahoo.com stands for “farm”, as in which server-farm your mail-account with Yahoo! Mail is based on.
The staff behind Yahoo! Mail made a post on their blog, which they gave the entertaining name “We’ve parked your Mail account next to the tractor“.
An interesting thing that the staff write in this blog-post is:
“But we regularly move accounts from farm to farm to balance the load on our servers. So there’s no guarantee your account will be on any specific farm for any amount of time.”
I know Yahoo! has immense traffic and a gigantic datastorage over at their end, but why not do what Google has done and only point to “mail.google.com”, or in Yahoo!’s case: “mail.yahoo.com”?! This would make such questions never pop up in their customers, aka their users’ minds.
Speaking about Yahoo! Mail; The beta of their webmail-service is a nice, yet a bit heavy on the local computer, but it does have more features making it closer to a “real” email-client than what their biggest competitor Google Mail.
Though, one of the major downsides of Yahoo! Mail is their advertisements. It takes up way too much of the usable space. I can’t wait, or at least I hope this day comes, when Yahoo! ditches their banner advertisements in their webmail-service and implements context-based text-ads.