When a landlord gives you a 60 day notice to vacate the apartment if they use the posting and mailing procedure, does the mailed letter by law have to be certified so there can be proof the tenant received it?

Not necessarily. The landlord must be able to prove to the court that the tenant received the notice as required by law. There are options open to accomplish this.

.. You may deliver the notice to a person of suitable age residing at or in charge of the leased premises.
.. It is acceptable to post the notice conspicuously on the front door of the residence if you also send the notice by certified mail to the tenant the same day you post the notice.
.. Using a professional process server is that he or she will prepare an affidavit of service that you can present to the court and the affidavit will be difficult for the tenant to challenge.
.. The best practice is to send the tenant certified mail, return receipt requested.

Being that some people would try to duck a certified letter being sent to them other actions had to be put in place to help in the eviction process.