Yes there is.
No mail delivery today February 21, 2011
no- not in the United States since it's Independence Day .
In the United States, there is mail delivery on February 15 & 16, 2013 but not on February 18, 2013.
no.
To determine if there is mail on February 10, it depends on the specific year and whether it falls on a weekend or holiday. In the United States, for example, mail typically does not operate on federal holidays. If February 10 is a regular weekday, then there would generally be mail delivery. For accurate information, it's best to check with your local postal service.
February 21, 2011 is Presidents' Day, a federal holiday. Consequently there is no delivery of U.S. Mail on that day. Private delivery companies, however, may deliver on that day.
nope, its a holiday
yes
yes
Yes.
In Poland there is ;)
A certified letter is a type of mail that requires the recipient to sign for it upon delivery, providing proof that it was received. This is different from regular mail, which does not require a signature and may not provide confirmation of delivery.