I am managing several servers at Amazon EC2, and one of them is not sending mail at all, strangely. All of them were set up using default Amazon Linux 64bit.
The mail agent is default sendmail, and "ps ax" shows that it is alive. However, "mail (mailaddress)" does not send mail at all. It accepts inputing subject and text normally, but I can't receive a mail.
/var/log/maillog is empty, so I don't know what's going on. Does anyone have any idea how can I get a clue for this matter?
P.S. Sorry, all of mails are actually sent and were in Gmail's spam folder