Reset forgotten password of common account

If you forget the password for your mailbox and you do not have the option to obtain it, for example from a browser or e-mail client, you must change it in the webmail  mailbox administration after logging in to the POSTMASTER account.
Open the address in your browser and log in to the Smart webmail.
In the top menu choose Admin.
If you can not see the Admin option, choose Tools and then Admin from the dropdown menu.
Please take a look at article Mailbox administration - part 2. "Email account changes" to continue.
Change password of your own mailbox
Log in to the Smart webmail. Click on Settings in the top menu. 

In the accounts' section, click on the appropriate mailbox

Go to Password tab and change the password

Other useful information
Do I need to change password anywhere else?
After changing the password, most e-mail clients (eg after restarting the e-mail client) will display a dialog for entering the password with the option to save a new password, see the example below from Outlook (tested clients: Outlook 2003 to 2013, Outlook Express, Thunderbird, Apple Mail, Opera Mail ):
In this dialog, just enter a new password and check the option to remember it. The password in the email client will be updated.
Weak password 
You can recognize it by the following parameters
  • the password is the same as the username or domain without the TLD (mailbox has a password info or mydomain);
  • it is shorter than 8 characters;
  • it consists of name, surname, company name, words found in dictionaries;
  • the password is a sequence of numbers or letters (eg 12345678, qwerty);
  • it contains only one character (e.g. aaaaaaaa).
How does a strong password look like?
There are many definitions of "strong password" on the Internet. Most agree that it should consist of a combination of lowercase and uppercase letters, numbers, and special characters.

Yes, the password Ak@47_58#Sa!O9H^x4U is difficult for a spammer to deal with. Unfortunately, even its rightful user does not remember it. This is not the best way to ensure at least basic comfort and a certain degree of safety.

No worries, lets use a common word and make a substitution and change the size of a few letters. So what about the following password: maNH@tAn_89? That's better, isn't it? But how do I remember it? What letter is actually uppercase? Which 'a' I actually replaced with @ - the first or the second one?

Easy to remember password does not have to be necessarily  "weak". Daniel Watson from Camden, London will probably easily remember this password DnlWtt-Cmdn-Lndn. It is nothing more than Daniel Watt-Camden-London. Just leave out the vowels.