When you send a letter to a lady, it goes from the Inbox folder to the Outbox folder. This means that the letter appeared in the lady’s Inbox.
If you see number in red cycle, it means that the lady hasn’t read your letter yet. When she will reply, all the correspondence chain will move to your Inbox.
In case you do not see correspondence with the lady in Outbox, you probably placed it in other folders, for example, in the Trash folder.
To check which folder your letter is in, you need to use the search function in Mailbox and enter lady’s ID there.
After that, the system will show you a letter of that lady and the folder in which it is located.
To move the conversation back to Inbox, you need to click on the “...” icon and select the desired folder for transfer.