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-1
votes
1answer
34 views

Secure postfix smtp from spammer

I run on Centos 5 with Parallels Plesk 12 and look for to secure my smtp server. When I watch at log, I see some strange line like that, which I supposed it's hack connexion. Has someone any idea on ...
3
votes
1answer
195 views

What does an empty AUTH EHLO SMTP response mean with MS Exchange?

I'm a programmer, not a sys-admin, but my customer's sys-admins are not being helpful and after much googling I still can't find the answer to this. My Java application gets the following response ...
0
votes
1answer
204 views

postfix smtp-auth with dovecot cannot authenticate

On Centos 6.5 i run postfix with postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = ...
1
vote
1answer
524 views

Exim4 SMTP server allows unauthenticated users to send emails

I use Debian 7.x amd64 + Exim 4.82 on a dedicated server, I also have a working SMTP server on a shared hosting. I would like to setup an SMTP on my VPS that will have some special delivery ...
0
votes
3answers
3k views

POSTFIX fatal: no SASL authentication mechanisms

I am struggling with the error above for more than 5 hours. I had tried to remove Postfix completely and I had followed the instructions of the next manual and the SASL manual in order to reinstall ...
-1
votes
1answer
147 views

Exchange 2010 view SMTP authentications

Is there a way to view authenticated SMTP Sessions? We are getting lots of SMTP traffic in our tracking logs at odd hours of the day. What I'd like to do is to see which user(s) are sending SMTP ...
1
vote
1answer
312 views

Postfix SMTP authentication per domain

Is it possible to configure SMTP authentication on Postfix with different user/pass credentials for different domains? So, I have a MTA that relays emails from ~20 different domains. When sending ...
0
votes
1answer
296 views

Email server fails to authenticate my client, returns “use web to login”

I'm trying to send a mail message using System.Net.Mail.SmtpClient via Yandex Mail and have the following transcript: S: 220 smtp17.mail.yandex.net ESMTP (Want to use Yandex.Mail for your domain? ...
1
vote
1answer
119 views

Postfix security: Accepting emails for and sending emails from my domains only

I have a virtual server running Debian Wheezy, and I am trying to configure it as a Postfix mail server. I haven't found though any easy to follow tutorial on how to secure Postfix... and my mail.log ...
0
votes
0answers
125 views

IIS Virtual SMTP Service — Integrated Windows Authentication with Administrator

I'm playing around with the authentication features on an SMTP service running on Windows Server 2008 R2. I have coded up a quick email-sending console app in C#, with support for connecting by Basic ...
0
votes
3answers
748 views

Can I send email unauthenticated to an internal SMTP server which then relays onto authenticated SMTP?

I have a back-end system which only supports sending email to an *UN*authenticated SMTP server, however, ultimately it needs to go via an authenticated SMTP server on the public internet. My idea was ...
0
votes
1answer
66 views

Spamming from Exchange 2003

I am apparently spamming the world (about 1000 a day) but cannot figure out how. Mxtoolbox does not list me as an open relay and I have disabled all relays that I can find. I have run every virus ...
-1
votes
1answer
217 views

How to do Postfix accept outgoing mail from another internal servers

I have a MTA with Postfix SSL/TLS configured and sending messages perfectly fine. In the same internal network, I have other servers that I want to send mail through this MTA. In main.cf variable ...
-3
votes
2answers
2k views

centos 6.4 sendmail SMTP-AUTH not working

I want cinfugiure centos 6.4 server with sendmail and dovecot to SMTP-AUTH , I configure saslauthd and sendmail, but the SMTP-AUTH is not function,actual configuration is [root@server sasl2]# rpm ...
-1
votes
1answer
186 views

SMTP , they are hacking my server spammed? [closed]

2013-04-15 18:12:55 217.119.50.209 OutboundConnectionResponse SMTPSVC1 ADSERVER - 25 - - 250-blue-ld-242.synserver.de 0 0 28 0 359 SMTP - - - - 2013-04-15 18:12:55 217.119.50.209 ...
0
votes
1answer
646 views

Postfix on Ubuntu tried everything, won't send emails

I'm trying to get postfix set-up on Ubuntu 13.04 but no luck so far. I found a few answers here on ServerFault that didn't work. I re-installed a bunch of times, nothing. This is my first time dealing ...
2
votes
1answer
163 views

Enabling smtp authentication on postfix with users in another smtp server

I am trying to replace an existing qmail installation with postfix. Qmail is currently authenticating outgoing smtp from users clients with a perl script. This script checks user's provided ...
1
vote
1answer
593 views

Exchange won't log in to smart host

My Exchange 2010 server is configured to relay mail to a smart host. Basic authentication is required over TLS. For some reason, Exchange doesn't feel like logging in. I see the following error ...
0
votes
1answer
831 views

Telnet to SMTP gets no 220 response unless user is specified

My server is setup to generate outgoing email only (no receiving), and is timing out when attempting to contact smtp.example.com Essentially the email is generated by a process on ...
0
votes
1answer
294 views

Postfix Authentication Issue

I originally followed this guide to get my mail server going. It works great but is a security nightmare, so piece by piece I'm securing it (anti virus, spam, smtp security, TLS) I'm currently trying ...
3
votes
2answers
412 views

Security Risk involved in disabling SMTP authentication on POP3 Server?

I provide IT Services to a client who, for the longest time in the world, has been using a POP3 server from Network Solutions to handle their email. At this time, I'm introducing the McAfee SaaS ...
0
votes
4answers
3k views

Postfix: Allow SMTP AUTH only from specified IP address ranges

can one implement an IP address based restriction for SMTP AUTH in Postfix? Scenario: I'm running a Postfix mail server that receives mails from all over the Internet. But the server doesn't only ...
1
vote
1answer
1k views

Postfix smtpd won't talk to saslauthd

I have an saslauthd setup to authenticate against PAM. It seems to do its stuff: root@sasltest:~# testsaslauthd -u quest -p #### -s smtp 0: OK "Success." I have libsasl 2.1.23, postfix 2.7.1. I ...
2
votes
2answers
3k views

Postfix “AUTH-LOGIN” no longer being offered for smtp auth after upgrade from Ubuntu 10.04 to 12.04.1

After doing a major Ubuntu dist upgrade from 10.04 to 12.04, my virtual-user postfix / dovecot installation only offers "PLAIN" SMTP Authentication mechanism. It used to offer PLAIN + LOGIN ...
1
vote
2answers
145 views

Postifx: how can someone send e-mail without authorization with this configuration?

Yesterday I found that 10 thousand e-mail messages were sent through my system using this configuration: http://pastebin.com/bThpH1s8 - main.cf http://pastebin.com/kkxxsstP - master.cf I temporarily ...
1
vote
0answers
841 views

530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is ...
4
votes
2answers
3k views

Can't get SASL auxprop/sasldb working with postfix/Ubuntu 12.04

I have an Ubuntu 8.04LTS system running Postfix 2.5.1. On that system SMTP AUTH runs fine. The contents of /etc/postfix/sasl/smtpd.conf are: pwcheck_method: auxprop auxprop_plugin: sasldb mech_list: ...
1
vote
1answer
3k views

Roundcube, Postfix and SMTP authentication (CRAM-MD5) error

I'm having trouble configuring Roundcube with SMTP authentification on Postfix. All the credentials are true, because I have no problem using the e-mail from Thunderbird and my mobile phone e-mail ...
2
votes
1answer
3k views

Postfix SMTP auth not working with virtual mailboxes + SASL + Courier userdb

So I've read a variety of tutorials and how-to's and I'm struggling to make sense of how to get SMTP auth working with virtual mailboxes in Postfix. I used this Ubuntu tutorial to get set up. I'm ...
0
votes
0answers
315 views

Sendmail smtp-auth issues

I'm running into a problem with Sendmail trying to implement SMTP- auth. I"m running 8.14.5 and have saslauthd running under FreeBSD 7.0-R. I don't believe I have starttls enabled (but I also ...
0
votes
1answer
218 views

exim greylisting non-auth SMTP mail?

I have smtp auth set up on my exim4 Dqueeze server so that only auth'ed clients can use it as a mail relay. I believe this is working, e.g. thunderbird (w/out password) reports that I am "not yet ...
1
vote
1answer
417 views

Nginx Server with Ruby on Rails application SMTP Authentication Error

I'm developing a Rails app which when I run it locally, it's able to send emails through a gmail account via smtp. When I moved it to my sever (running Nginx), it comes up with the following error ...
0
votes
1answer
737 views

Postfix: combine check_client_access and check_sender_access for Relayaccess

We have a mailserver running on Postfix. Only authenticated users are allowed to send emails. One client has a multifunction printer, which is configured to send scanned documents to an email ...
3
votes
2answers
3k views

How to enforce sender address to be “logged-in-user@example.org” in Postfix?

I have set up a Postfix server with SMTP AUTH (STARTTLS on port 587). All my users are in the domain "example.org". I want to enforce the sender address to be "logged-in-user@example.org". I learned ...
1
vote
1answer
329 views

SMTP Question. Why does send succeed when Authentication fails

I have an application written in .NET framework that sends emails using our STMP server. I was researching another emailing issue which caused me to look at the SMTP logs. Here is a sample SMPT log ...
2
votes
1answer
2k views

How to add DKIM feature to the IIS 7.5 - Windows Server 2008 - DomainKeys Identified Mail

How to add DKIM feature to the IIS 7.5 - Windows Server 2008 DomainKeys Identified Mail
-3
votes
2answers
770 views

Error Code: 503 Unable to receive emails

I am running an emailing system using which I am able to send email. Of course my emails are directly moving to user's spam bin. Strange that I am unable to receive emails from any other domains. I ...
1
vote
3answers
215 views

Network Hardware supports SMTP, but no AUTH information… Need to Send emails through SMTP with AUTH

I have a network device that supports sending email notifications, but doesn't provide for the username and password. I would like to point this device to an internal system which would then take care ...
0
votes
2answers
1k views

How to reject relaying e-mail from users impersonating myself to myself

Trying to use my server as a relay to send mail to another server gives you relay access denied, this is correct behavior. MAIL FROM: admin@myserver SMTP -> FROM SERVER: 250 2.1.0 Ok RCPT TO: ...
0
votes
1answer
368 views

Protecting server from smtp auth relay attack

Server configuration OS Centos 5.xx SMTP exim / dovecot I would like to know how to protect my server from smtp relay attacks. Currently my server is experiencing smtp relay attack because of ...
0
votes
1answer
574 views

Postfix SASL error

I'm trying to configure my postfix server to accept connections from outside mail clients using SASL authentication with dovecot. It was previously setup with cyrus sasl. However when I try to send ...
2
votes
3answers
264 views

proxy software to relay email

My some software applications need to relay emails to my email account. The only way they can do it via connecting to localhost which relays mail on behalf of application. I have forgotten the name ...
0
votes
1answer
525 views

smtp sasl authentication failure

I have configured and fixed almost all the problems with my postfix +courier + mysql setup for virtual mailboxes. I can now receive mail and send it from webmail (squirrel). BUT, what I can't do is ...
2
votes
2answers
1k views

issue using Postfix as authen SMTP client relay to Exchange 2010

I'm using postfix to relay mail to Exchange 2010. Here is my config: relayhost = [smtp.exchange.2010] smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/relay_passwd ...
2
votes
1answer
5k views

Postfix + SASL = “Relay Access Denied” when sending from outside the network

I have in /etc/postfix/main.cf: smtpd_sasl_auth_enable = yes smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination and SASL seems to be working: $ ...
2
votes
2answers
1k views

what is the location of the log file for bugzilla on windows

We are using Bugzlla on windows. We set up the SMTP server configuration in the admin parameters. But Bugzilla is unable to send emails. It always reports "Could not authenticate user". How to know ...
0
votes
3answers
965 views

Postfix+sasslauthd+PAM How can I deny/allow specific users from authenticating?

I have a simple postfix installation on RedHat that's been running fine for years and uses TLS/saslauthd/PAM to allow users to authenticate to relay mail from the external network. All users are local ...
1
vote
3answers
3k views

Spamhaus PBL stops email even though SMTP-AUTH is enabled

My emails to D-Link get bounced due to my Comcast IP being on the Spamhaus PBL. Spamhaus says there's no way to get removed from the list and the only way to bypass this filter is to enable ...
1
vote
1answer
837 views

Postfix sasl relay host

I'm trying to set up SASL to a relayhost to send external email. I've read a hell of a lot and done everything I'm supposed to have done. However our provider won't accept me relaying emails with (we ...
1
vote
1answer
827 views

How can I force users to send mail using submission port (587) with Exim?

I would like to force users of a system to send email only using a submission port (such as 587) and then disable authentication on port 25 so I don't have users trying to authenticate using plain ...