Are there errors in yourforum.com/logs?
You problem reminds me of 我搭建了discourse，激活了账户邮箱，为什么还是每隔一会儿不断发送激活账户信息的邮件？？怎么配置解决这个bug - #23 by supermathie and Duplicate registration email issue
Configure QQ Mail sending, email arrives normally, but Discourse reports errors and sends duplicates
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