Arrive at the mailing place meaning

A common phrase!

"Arrive at the mailing place" is a idiomatic expression that means to reach the destination where you need to send a package or mail. In other words, it's the location where you can drop off or send your mail to be delivered to its intended recipient.

In the United States, this is often referred to as the "post office" or "USPS" (United States Postal Service). In other countries, it might be called the "post office", "mail center", "mailroom", or "sorting office".

So, if someone asks you to "arrive at the mailing place", they're asking you to go to the location where you can send your mail or package to its destination.