Analysis and solutions to No appropriate protocol error when SMTP sends emails

Table of contents

1. Specific errors

2. Analyze the problem

3. Practical solutions

plan 1:

Option 2 (recommended):


Basic environment: JDK 1.8.0_333

1. Specific errors

Caused by: jav

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Origin blog.csdn.net/FENGQIYUNRAN/article/details/132969510