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4
votes
3answers
843 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
6k 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
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
3answers
5k 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
207 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
1k 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 ...
7
votes
2answers
4k 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
5k 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
5k 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
264 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
710 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 ...
0
votes
1answer
1k 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 ...
7
votes
3answers
6k 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
622 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
3k 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
1k 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
228 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: admin@...
0
votes
1answer
531 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
1k 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
297 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
679 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
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 ...
3
votes
1answer
7k 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
3k 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
1k 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
4k 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 SMTP-AUTH....
1
vote
1answer
924 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
1k 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 ...
4
votes
1answer
3k views

How can I configure Exim to drop non-authenticated connections on alternate SMTP port?

I currently only allow connections on port 25 from a mail filtering service's IPs. I have Exim running on an alternate port for SMTP submission. This port needs to allow non-encrypted connections ...
3
votes
2answers
4k 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: <...