Short Answer 
To determine where a letter was mailed from, examine the postmark for date and location, analyze the type of paper used for additional clues, and investigate the handwriting style for insights into the sender’s characteristics. The postmark is the most reliable indicator, while paper type and handwriting provide supplementary information.
Step 1: Examine the Postmark
The first and most reliable method to determine where a letter was mailed from is by examining the postmark on the envelope. A postmark is an official mark placed by the postal service that shows the date and location of mailing. This information is essential as it can pinpoint the origin of the letter and provide details about when it was sent.
Step 2: Analyze the Paper Type
The next step is to analyze the type of paper used for the letter, although this is less reliable than the postmark. Different brands or specialized papers may indicate the sender’s preferences or region, but they often do not provide definitive proof of the letter’s origin. Still, unique paper types can serve as supplementary evidence in narrowing down possibilities.
Step 3: Investigate Handwriting Style
Lastly, consider the handwriting style of the sender. While the handwriting may offer personal clues, it typically does not reveal the specific location where the letter was mailed from. However, analyzing the handwriting can provide insights into the sender’s characteristics, such as their education or personality traits, which can be part of understanding the context of the letter.