It depends on the ISP, and how you set up your mail. Some ISPs, using IMAP format, do not even use a Sent folder. However you can find the sent mail in the Local folders. Check there.
And, this is the wrong place to post 7.2 issues. Also, look in your mail and newsgroups settings, and see what are the settings in Copies. They, often can be changed.
If you have more questions, post at the other Netscape, Mozilla, etc board, and quote this thread.
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; AOL 9.0; Windows NT 5.1; BCD2000; .NET CLR 1.1.4322)
A minority may be right, and a majority is always wrong
~ Henrik Ibsen
WinXP, SP3, 512 MB, SM2.17.1, FF21, TB17.O.5, IE8.0, Google Chrome 26, Ghostwall , Kingsoft5.6, JRE1.7_21.