Mail error, can't send anything and tried everything :p

[Pillas]

So, i have been getting these Error messages when trying to send things like either activation emails, or notify of new threads emails:

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Today at 08:05:31 am
148af40f22599e447bb9c85d7f9cf5c2
Type of error: General
Unable to send mail to the email address '[email protected]


PHP.ini is configured right, installed sendmail through apt-get to try to use the localhost (always worked before) And it doesn't work now.

I have opened all the usual smtp ports, and still nothing.

My config has either been:

SMTP: localhost
Port: 25 and others
Password and username = none

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Or using smtp.gmail.com [nofollow] and my username and password that i normaly use on gmail. None of them work.

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Tail of mail.log:

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Aug 28 09:05:11 C025 sm-mta[13561]: o7S75BjY013561: o7S75BjZ013561: return to sender: User unknown
Aug 28 09:05:11 C025 sm-mta[13561]: o7S75BjZ013561: to=server-lu, ctladdr=root (8/0), delay=00:00:00, mailer=local, pri=0, dsn=5.1.1, stat=User unknown
Aug 28 09:05:11 C025 sm-mta[13561]: o7S75BjY013561: Saved message in /var/lib/sendmail/dead.letter
Aug 28 09:05:24 C025 sendmail[13567]: o7S75OV2013567: from=root, size=2551, class=0, nrcpts=1, msgid=<[email protected]>, relay=root@localhost
Aug 28 09:05:24 C025 sm-mta[13569]: o7S75OtB013569: from=<[email protected]>, size=2829, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Aug 28 09:05:24 C025 sendmail[13567]: o7S75OV2013567: [email protected], ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=32551, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (o7S75OtB013569 Message accepted for delivery)
Aug 28 09:05:24 C025 sm-mta[13571]: STARTTLS=client, relay=mail.chasenet.org., version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-SHA, bits=256/256
Aug 28 09:05:25 C025 sm-mta[13571]: o7S75OtB013569: to=<[email protected]>, ctladdr=<[email protected]> (0/0), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=122829, relay=mail.chasenet.org. [91.204.208.19], dsn=2.0.0, stat=Sent (Ok: queued as 2521A11462)
Aug 28 09:05:31 C025 sendmail[13574]: o7S75Vwm013574: from=www-data, size=1213, class=0, nrcpts=0, msgid=<[email protected]>, relay=www-data@localhost
Aug 28 09:05:31 C025 sendmail[13575]: o7S75Vh5013575: from=www-data, size=1350, class=0, nrcpts=0, msgid=<[email protected]>, relay=www-data@localhost


Note that the last one here is normaly just the localhost smtp errors i presume?

Any hints? Ah, and i forgot, im running on debian

[青山 素子]

If the lines you posted are of the mail going out, the third from last shows that remote servers are accepting messages.

[Pillas]

I still get the "Could not send message" in the SMF error log though

[Kill Em All]

Did you try setting mail type as php? Is the webmaster email something like @yourdomain.com or @gmail.com? If @yourdomain.com, then you can just use the php mail type, if @gmail(or any other public email service), you would use SMTP. Make sure its properly setup. Since it looks like you are using gmail... I think, take a look at this:
http://www.simplemachines.org/community/index.php?topic=343385.0