Comments on: SMTP Authentication (SMTP Auth) in Postfix

By: dC

dC — Tue, 18 Aug 2009 22:51:44 +0000

somedomain.com was just an example, I didn’t want to list my actual domain, which happens to be open relaying at the moment.

I know I can send to emails within my domain. However, this is sending to emails outside my domain (ie. gmail.com, hotmail.com etc)

By: consultant

consultant — Tue, 18 Aug 2009 22:42:48 +0000

Hi dC,

Does somedomain.com belong to you? You can send to email addresses belonging to your domain without authentication. This is normal as it enables you to receive mail from the outside.

By: dC

dC — Tue, 18 Aug 2009 17:45:24 +0000

Great Tutorial. One question though.

When I telnet to my Posfix server on port 25 I’m getting relay denied when trying to send to user@domain.local. Which is as stated.

However, if i try and send to email@somedomain.com it will send out email without authentication.

By: Zammhauer

Zammhauer — Thu, 09 Jul 2009 07:06:15 +0000

Does anybody know how to configure postfix to get such messages:

550 5.7.0 From address is not one of your addresses.

I would like to check whether the “mail from” equals the email-adress given by the plain login (my usernames are like “name@domain.tld”) to prevent using a valid login for spamming.

By: Yenin

Yenin — Wed, 20 May 2009 21:25:03 +0000

Hi,
I have problem.the Postfix log file show me the following messages in my maillog.log

>postfix/smtpd[25031]:warning:smtpd_sasl_auth_enable is true, but SASL support is not compiled in

But i ejecut the follow command and i can see the sasl lib are correctly linked
/r/a/p/u/sbin> ldd postfix
libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0×000000381cb00000)
libssl.so.4 => /lib64/libssl.so.4 (0×0000002a9557c000)
libcrypto.so.4 => /lib64/libcrypto.so.4 (0×0000002a956b9000)
libldap-2.2.so.7 => /usr/lib64/libldap-2.2.so.7 (0×0000002a958ea000)
liblber-2.2.so.7 => /usr/lib64/liblber-2.2.so.7 (0×000000381cf00000)
libpcre.so.0 => /lib64/libpcre.so.0 (0×0000003821300000)
libdb-4.2.so => /lib64/tls/libdb-4.2.so (0×0000002a95a21000)
libnsl.so.1 => /lib64/libnsl.so.1 (0×000000381eb00000)
libresolv.so.2 => /lib64/libresolv.so.2 (0×000000381d700000)
libc.so.6 => /lib64/tls/libc.so.6 (0×000000381c600000)
libdl.so.2 => /lib64/libdl.so.2 (0×000000381c900000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0×000000381dd00000)
libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2
(0×0000003821d00000)
libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0×0000003820f00000)
libcom_err.so.2 => /lib64/libcom_err.so.2 (0×0000003820700000)
libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0×0000003821100000)
libz.so.1 => /reduc/lib/libz.so.1 (0×0000002a95c02000)
libpthread.so.0 => /lib64/tls/libpthread.so.0 (0×000000381cd00000)
/lib64/ld-linux-x86-64.so.2 (0×000000381c400000)

someone has an idea how can I solve this?

By: Diego

Diego — Wed, 28 Jan 2009 20:10:40 +0000

nevermind my posts, dont know what I did but got everything working.

By: Diego

Diego — Mon, 26 Jan 2009 04:14:00 +0000

In addition to my previous post, I’m just really wanting people to be able to send me emails to accounts on my mail server, but I dont want people to be able to connect through telnet to my server without authentication, due to my server being used to send out immense amounts of spam through telnet connections in a previous instance.

By: Diego

Diego — Mon, 26 Jan 2009 02:18:22 +0000

Hi there, I did all this, and have the authentication running perfectly. The only thing is, I cant receive emails. When I send an email to an adress on my mail server from my gmail account, it bounces back saying “Relay access denied” (state 14)

By: consultant

consultant — Thu, 08 Jan 2009 23:36:33 +0000

Hi Ramesh,

Command should be

perl -MMIME::Base64 -e ‘print encode_base64(“\000username\000password”)’

If username is an email address, add a slash in front of @

test\@domain.com

By: Ramesh

Ramesh — Thu, 08 Jan 2009 14:24:34 +0000

Please let me know the command to create base64 encode user and passwd.

i am trying with following, which is not working, the one created using in this web site works fine.
perl -MMIME::Base64 -e ‘print encode_base64(“rameshkunal_123″);

Regards,
Ramesh.