My account stoped to received emails in July and never came back.
All the mails never get in the inbox saying that the account or alias don't exist.
It's a pitty but the lesson is: NEVER; NEVER; NEVER trust in a webmail server.
Check everyday your email account in order to known if it's receiving emails or not.
That way you will known if there is a problem or not with your mail account, username, alias, etc.
Always download all your mails and keep them in your computer... just in case.
Always keep a mail list of ALL your email contacts in your computer.
In case of a webmail server problem or account problem, create a new account in somewhere else and email all your contacts with your new mail address.
Some can say that the google is better and never crash. But I can say it crash too. Nowdays I can't forward my mail messages as I did before.
It seems that the google is starting to have problems too.
Don't rely on any webmail server, mainly if your account have a few years.
And don't be foolish if you don't see any complaints in the web. Yahoo, google and everyone mark the complaints as resolved, despite their resolutions never had happened.
Other times they simply removed the complaints.
And if you are foolish enough you can belive them. But if you still have the same problem, then you don't be alone. Lots of us still have the same problem.
And we never believe in their words if they don't handle the situations.....
Just follow the tips above and be prepared to abandon your loved email account.
Always keep a actualized copy of your emails in your computer if they are importants to you.
And be prepared.... just in case you get problems with your email account.