how can i tell if my friend has been checking his e-mails?
148298
In server when problem occurs at that time we are sending mail means it will be send and it will not reach the destination. so it may reach the third party but it occurs rare only not frequently. We have to use some specialised software or we have to develop for our own use to check it.
470006
If you mean is there a database or the info stored somewhere that would tell you that, then no.\n\nYou can add the person's ID to your messenger & watch to see when s/he comes & goes offline.
336917
You could use Thunderbird to check your email. It has adaptive spam filters:\n\n"Each email you receive passes through Thunderbird's leading-edge junk mail filters. Each time you mark messages as spam, Thunderbird improves its filtering so you can spend more time reading the mail that matters. Thunderbird will also use your mail provider's spam filters to keep junk mail out of your inbox."
92245
ask him or her or find a  email address finder{ many free ones out there}
76761
This free program will check all web based email accounts at once (Yahoo, Hotmail, etc):\nhttp://www.eprompter.com/
473593
More details are needed to answer the question correctly. You can look at log.nsf file to track the user activity. Alternatively, on the user mail file you can enable activity logging (property -> info tab -> User Detail button under activity) to track how it is being used.
815130
you can click on sent mail & it will tell if you if it has been read/replied/forwarded
669577
If online, Checks in the Mail.\nwww.checksinthemail.com
529093
Look under preferences or account options. Usually there is a place that says to let you know when your email is read.
403673
go to sent messages. if its there then it got sent
158177
Some e-mail systems offer a trackback, you can tell if someone has opened the message, for instance. But these only work within some limited system (say AOL mail to another AOL user). \n\nYou generally can't track an e-mail sent to another person on another system. For instance AOL mail to Yahoo, has no tracking.\n\nSome systems I have seen which allow tracking also let you know if you are being tracked. These have been messages sent on internal corporate systems, though, and I forget the details.\n\nIf you're sending some message else where it can't be tracked by you.\n\n\nHowever, if you want to know if your message is being read by others, there isn't any way to tell, but anyone with access to a mail server can read the messages. I don't worry about this with something like Yahoo mail (unless they get a request from the government), or even in large companies. \n\nBut it is quite possible that in a small to medium sized company someone is reading your mail. They are almost certainly not supposed to, but it happens. Also, if there is going to be a record of your e-mails on these servers too, and the company may be able to go back and see what you are doing if they are so motivated.
1174096
Just email him, he will have to check his computer sooner or later......................................
27230
Yes,you can install "DidTheyReadIt.When you use  DidTheyReadIt, every e-mail that you send is invisibly tracked without alerting the recipient.\n\nBut when they read your message, you will immediately receive the following information:  \n  When, exactly, your email was opened.  \n  How long your email remained opened.  \n  Where, geographically, your email was viewed.  \n \nYou can get it at the site below.
42797
As long as you are not receiving a MailerDaemon message in return, he is receiving the messages. However, there is no way of knowing whether or not that email was filtered out as junk/spam without asking him directly.\n\nIf you really are sending an enormous number of emails, that could cause the system to think that they are spam. It's also possible that your friend accidentally clicked on a wrong button and marked your messages as spam. However, as I said before, there's no way for a sender to know whether or not his messages have been received. This is one of the ways people are protected from spam mails.
242713
There is no machine by which u can check. Just try to listen and understand him carefully. If he share his things with you, he may be sincere. but there is no hard and fast rules for this.
165764
1. He doesn't know who you are.\n\n2. You are sending too many e-mails and this is his way of getting you to cool it. \n\n3. He doesn't check his e-mail that often and hasn't seen it yet.\n\n4. He saw it but didn't have enough time to reply.\n\nI'm sure there are a hundred other possibilities.
642974
If you mean ones you havent deleted you can do an e-mail search when you are in your yahoo inbox just use the  persons id for the search.