I have installed ProtonMail Bridge on Ubuntu 20.04 (All MX records are configured, all SMTP records are configured; the tutorial for installation is https://gist.github.com/githubcom13/2f30f46cd5273db2453a6e7fdb3c422b?permalink_comment_id=3862036). My server starts to send emails and receive perfectly from the domain email. However, I start to receive strange messages like “Have no financial skills? Let Robot make money for you. Telegram - link for the telegram bot”. The recipient and the sender are the same - 1 domain email configured/added in ProtonMail Bridge (for example, test@my_domain). Maybe you can help me and direct where should I look for solving this problem? Thanks in advance. The bot name is always the same, it’s cryptaxbot (maybe this information will be helpful).
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You’ll need to configure a spam filter. Check the following article here:
You can configure different rules to outline spam and not actually reach you but put in in the spam folder.