If username looks like email (which is normal for Mail.ru Agent (modern ICQ protocol)), e.g. [email protected] bot sees it like "myemail%40list.ru" and decides that message comes from another user, who was not started a conversation with the bot yet.
If username looks like email (which is normal for Mail.ru Agent (modern ICQ protocol)), e.g. [email protected] bot sees it like "myemail%40list.ru" and decides that message comes from another user, who was not started a conversation with the bot yet.