Yes, there are coin-operated vending machines in Flensburg. These machines can be found in various locations such as train stations, shopping centers, and public buildings. They offer a variety of products including snacks, drinks, and even everyday essentials like toiletries and phone chargers. Customers can use coins to make purchases from these vending machines. **

To send an envelope with a prepaid return envelope, first place the items you want to send in the main envelope. Then, insert the prepaid return envelope inside the main envelope. Seal the main envelope and affix the necessary postage. Finally, address the main envelope to the recipient and it's ready to be mailed. When the recipient receives the main envelope, they can use the prepaid return envelope to send items back to you without having to worry about postage. **

"With or without envelope?" is a question commonly asked when sending a letter or card. It refers to whether the sender wants the item to be placed in an envelope before being sent. If the sender chooses "with envelope," the item will be enclosed in an envelope for protection and privacy. If the sender chooses "without envelope," the item will be sent as is, without any additional packaging. **

The postal service considers the thickness of an envelope fairly strictly, as it can affect the ability of the envelope to be processed through their automated sorting machines. Envelopes that are too thick may get caught or damaged in the machines, causing delays or damage to the mail. Therefore, it's important to ensure that the envelope meets the postal service's thickness guidelines to avoid any issues with processing and delivery. **

To drop a self-addressed stamped envelope in the mailbox, simply place the envelope with the stamp and your address on it into the mailbox. Make sure the envelope is sealed and securely placed in the mailbox slot. Once you have dropped it in, the postal service will collect it and deliver it to the address you have provided. **

At the first coin-operated vending machine, which was created in the early 1880s by Percival Everett, customers could purchase postcards for their money. The machine was installed in the railway stations and post offices in London, and for a penny, customers could receive a postcard featuring a picture of the surrounding area. This early vending machine was a novelty at the time and provided customers with a convenient way to purchase postcards without the need for human interaction. **

The contents of the envelope can vary depending on the sender and the purpose of the mailing. It could contain a letter, a card, important documents, money, a gift card, or any other item that can fit inside. The only way to know for sure what is inside the envelope is to open it. **

A stamped envelope is a pre-paid envelope that already has postage affixed to it. This means that the sender does not need to add additional stamps to the envelope before mailing it. Stamped envelopes are convenient for sending mail as they eliminate the need to calculate postage costs and affix stamps separately. They are often available for purchase at post offices and can come in various sizes and designs. **