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0
votes
2answers
11 views

Postfix multiple IPs: which to use for SMTP AUTH?

I am setting up a mail server which has separate IP addresses for sending and receiving mail. My config looks like this: # The addresses we send out on: smtp_bind_address = 185.xx.xx.101 ...
6
votes
3answers
4k 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 ...
6
votes
3answers
13k 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
vote
1answer
24 views

Exchange 2003 restrict anonymous smtp access only

On exchange 2003 I want to listen for smtp on port 25 only so that * anonymous login is only allowed from certain internal IPs * authenticated login is allowed from everywhere I can't see how to do ...
1
vote
1answer
543 views

Ruby on Rails application throws 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 server, it comes up with the following error for example when ...
6
votes
2answers
105 views

Postfix deny relay for some virtual users

I'm using Postfix as MTA and relay. Users that wish to send e-mail from a remote system authenticates and Postfix hands that to Dovecot, and this works well. But how can I limit which users can use ...
2
votes
1answer
252 views

check header for Authenticated sender in postfix

My users send email with SMTP AUTH via SASL Authentification. Unfortunately their mails would marked as NoBounceOpenRelay by Amavis. So I set this to postfix main.cf smtpd_sasl_authenticated_header ...
2
votes
0answers
218 views

IIS 6 SMTP unable to relay messages to Exchange Online

Our company uses Office 365 and our email is hosted on Exchange online; however, we have several applications which are unable to send messages directly to Exchange Online due to various reasons ...
4
votes
1answer
401 views

How do I get disabling SMTP plaintext authentication to stick on OS X 10.10 Yosemite's Server.app

I've got an SMTP relay server that I recently replaced with OS X 10.10 Yosemite running Server.app. It is running as an SMTP-only relay allowing only hosts from the LAN to relay out through it. We do ...
0
votes
1answer
810 views

Postfix: Relay access denied through SASL with permit_sasl_authenticated setted

I have Postfix 2.7 installed in Ubuntu 10.04 LTS. When I try to send a mail from Outlook (with smtp auth) to a gmail account (or others), I get relay access denied. The log (I've faked the emails): ...
1
vote
1answer
2k 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 ...
5
votes
1answer
64 views

Is Exchange 2010 compliant with RFC 3848

I have looked up Exchange 2010 Support for RFC Standards but do not see RFC 3848 amongst the supported standards. I do see RFC 4954 listed, which 'recommends use of RFC 3848 transmission types', ...
0
votes
2answers
405 views

Email server attack from telnet

My mail server having a problem on blocking some attacker that trying to telnet to our mailserver. but i'm not able to block it, ip will keep changing even we block by ip. seems like he is trying to ...
3
votes
1answer
890 views

Postfix Recipient address rejected: Access denied Error

Trying to use zend mail smtp to send email from my php app login authenticated and give me this constant error I don't have to deal with I look into de 36 question here on serverfault.com changing ...
-1
votes
1answer
80 views

Rewrite sender when relaying to provider server [duplicate]

I am trying to relay email thru my provider that has a mail server for my domain (xxxx.com). My postfix is configured as follows: relayhost = [smtp.xxxx.com]:25 the server requires authorization, ...
-1
votes
1answer
134 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 ...
0
votes
3answers
2k 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
505 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? ...
2
votes
1answer
6k 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: $ ...
5
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: ...
2
votes
2answers
2k 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
4answers
5k 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 ...
0
votes
1answer
1k 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 ...
3
votes
1answer
444 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
318 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
1k 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 ...
-1
votes
1answer
255 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
575 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 ...
1
vote
1answer
205 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
1answer
75 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
365 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
3k 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
228 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 ...
2
votes
2answers
2k 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
216 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
1k 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
365 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 ...
4
votes
2answers
609 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 ...
2
votes
2answers
3k views

SMTP-AUTH required for local domains?

Here is the problem: From any IP address not belonging to your mail server: telnet me.myemailserver.com 25 helo me.someserver.com mail from: <yourusername@mydomain.com> rcpt to: ...
1
vote
1answer
2k 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 ...
3
votes
2answers
4k 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
169 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
955 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 ...
1
vote
1answer
4k 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
4k 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
1answer
240 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 ...
0
votes
1answer
944 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 ...
0
votes
1answer
460 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 ...
1
vote
1answer
481 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 ...
3
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