Does republic of ireland need by air mail sicker

I think there may be a bit of a misunderstanding here!

The Republic of Ireland is a country located in Europe, and as such, it does not need "by air mail sicker" (I'm assuming you meant "by air mail sickle"?).

The Republic of Ireland has a well-established postal system, and mail can be sent to and from the country via various modes of transportation, including air, land, and sea. The country is also a member of the Universal Postal Union (UPU) and has agreements with other postal services around the world, making it easy to send and receive mail internationally.

If you're looking to send mail to the Republic of Ireland, you can simply use your local postal service or a private courier company, and they will take care of the rest.