支付宝邮寄到邮政局的信件，一定是邮政寄过来的律师函或者催款函。
为了确保对方能及时收到律师函，律师函一般用邮局特快专递（EMS）来寄送，因为邮局的特快专递比快递公司的快递更安全。一旦对方否认收到律师函，你可以让邮局出具对方已经签收律师函的证明，邮局出具证明的证据效力更强。
支付宝家庭医保的使用方法如下：
1. 打开支付宝 APP，点击右下角“我的”选项，进入个人中心。
2. 在个人中心页面，找到并点击“支付宝会员”。
3. 在支付宝会员页面，选择“我的家”，点击进入。
4. 在我的家页面，找到并点击“家庭小医保”，进入家庭医保页面。
5. 点击“去邀请家人”，按照提示操作，邀请家庭成员加入家庭医保。
once completed, you can use the family medical insurance benefits in the following ways:
1. Purchase medicines at a pharmacy: You can directly use the bound relative card to pay for medicines. Ensure that the cardholder and the person using the card are consistent.
2. Hospital visits: If you need to visit a hospital, you should first use your personal annual account funds, and then use the family medical insurance account funds.
3. Treatment services: Family medical insurance can also be used for various treatment services, such as checking outpatient records, purchasing medical supplies, and paying medical bills.
4. In-patient services: If you need to be admitted to the hospital, you can use the family medical insurance to cover part of the expenses.
5. Emergency rescue: In case of emergencies, family medical insurance can be used for emergency rescue services and related expenses.
To use the family medical insurance on Alipay, follow these steps:
1. Open the Alipay app and click on the "My" option in the bottom right corner, entering the personal center.
2. In the personal center page, find and click on "Alipay Member".
3. In the Alipay Member page, select "My Home" and click to enter.
4. In the My Home page, find and click on "Family Small Medical Insurance" to enter the family medical insurance page.
5. Click "Invite Family Members" and follow the prompts to invite family members to join the family medical insurance.
Once completed, you can use the family medical insurance benefits in the following ways:
1. Purchase medicines at a pharmacy: You can directly use the bound relative card to pay for medicines. Ensure that the cardholder and the person using the card are consistent.
2. Hospital visits: If you need to visit a hospital, you should first use your personal annual account funds, and then use the family medical insurance account funds.
3. Treatment services: Family medical insurance can also be used for various treatment services, such as checking outpatient records, purchasing medical supplies, and paying medical bills.
4. In-patient services: If you need to be admitted to the hospital, you can use the family medical insurance to cover part of the expenses.
5. Emergency rescue: In case of emergencies, family medical insurance can be used for emergency rescue services and related expenses.