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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

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Sorry, all of mails are actually sent and were in Gmail's spam folder...I've just fount them and immediately disabled Gmail's spam filtering. What a waste of time. – azusa Sep 11 '13 at 0:24
Now my question is why /var/log/maillog is empty only on that server. – azusa Sep 11 '13 at 0:25
Whoa, hang on! You really don't want your e-mails ending up filtered as spam. I've had this same problem in the past. How exactly are you using your e-mail server? There's a good chance anyone the e-mails are going to will receive it as spam and ignore it. Unless this is for you only you really shouldn't disregard the problem. – Dylan Sep 11 '13 at 1:14
This question appears to be off-topic because proponent realized all messages were in Gmail's spam folder – MariusMatutiae Jun 5 '14 at 12:59

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