Simple Mail Transfer Protocol (SMTP) relaying (transferring between computers).

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2answers
8k views

Exchange Connector Won't Send to External Domains

I'm a developer trying to get my .Net application to send emails out through our Exchange server. I'm not an Exchange expert so I'll qualify that up front!! We've set up a receive Connector in ...
2
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0answers
29 views

I need to set-up the blocked machine to relay to the unblocked machine using a different port

I have two Windows Server 2003 machines sitting in a network. Server B has port 25 open and can relay emails to the local network's smtp server. Server A does not have port 25 open. How can I set it ...
2
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4answers
1k views

Send emails from Linux via Google SMTP

I've gone as far as I can go on my own, but I'm not a Linux guru and am now stuck. I've got an Oracle database running Oracle Enterprise Linux 5.1 on an Amazon EC2 instance. I migrated it from a box ...
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5answers
513 views

Best Practices for Open Relay Email Server

I have a scenario where I need to setup postfix with no TLS, no SMTP authentication, and open relay allowing from only one remote IP address. Emails from this remote IP may have spoofed "from" address ...
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3answers
574 views

A flexible SMTP server that's open source or free

We currently have our own in-house email marketing software for our newsletters, and were using SQL server's SMTP agent to send emails through our local SMTP server (IIS) and then onto our ISP's SMTP ...
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1answer
368 views

SMTP delivery with multiple recipients

I'm going over some SMTP log files from an open relay server (IIS 6 SMTP Virtual Server), used to collect and route all automated email within a private network, to an internet smarthost (qmail at ...
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5answers
11k views

How to find out that SMTP server is in open relay?

I used nmap for network security testing. It found that SMTP server was in open relay. Here is the output: nmap --script smtp-open-relay testwww.confidesk.com PORT STATE SERVICE 25/tcp open ...
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2answers
2k views

POSTFIX main.cf permission denied

I am trying to set up a postfix server for smtp relay. Centos 5.5 I have followed http://mhawthorne.net/posts/postfix-configuring-gmail-as-relay.html but am getting a FAILED error when trying to ...
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2answers
23 views

Will a mail relay be blacklisted if it accepts a mail relay request then later sends NDR?

Got a question about blacklisting behaviour. Internet MX records for "mydomain.com" point to my anti-spam gateways. The anti-spam gateways then relay the email to my mail server. If someone sends an ...
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2answers
468 views

Postfix - unable to access externally

So I can't seem to access smtp from externally. When using a desktop email client (eM client and thunderbird both fail) I can't get it to hit the server at all. (eM client is trying to hit: ...
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2answers
153 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 ...
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3answers
8k views

How can email be resent that has been delivered to the Badmail folder in IIS?

We have IIS setup as an SMTP relay. A relay security error caused the outbound emails to be delivered to the badmail folder for the IIS SMTP Service. Is there any standard method for attempting to ...
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1answer
266 views

Exchange unable to relay mail outbound

I have some users configured in Exchange 2003 (delivery options tab) to forward mails to their external address. This was working fine until today. The mails are being held up in the SMTP queue ...
1
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1answer
181 views

Postfix changes to main.cf are not loaded

Ubuntu 10.04 LTS root@vm1613:/etc/postfix# vim /etc/postfix/main.cf [...] # default restrictions smtpd_sender_restrictions = check_sender_access hash:/var/spool/postfix/plesk/blacklists, ...
1
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3answers
5k views

How to configure sendmail to relay emails through Office 365 (SMTP) with TLS

I have a box running RHEL 6.3 and there's and application that needs to send out reports by mail, in order for this functionality to work I have to have mail configured in my box. In addition I ...
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1answer
852 views

using gmail as email relay for sendmail

I used to be able to send emails using a gmail account & sendmail configured using one of the guides on the Internet, for example: ...
1
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1answer
930 views

detect malicious script used to send mail

i was recently used as an open relay and mass spam was sent through my server. i since then stopped it but my maillogs grow enourmously with this type of log. Aug 20 07:00:29 veepiz ...
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3answers
4k views

exim4 to relay emails

I have exim4 installed on a Linux box. The basics work fine and I can send email from that machine without any problem to whatever email address. I also have a printer/scanner which is capable to ...
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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 ...
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3answers
5k views

IMAP/POP won't send allow emails to outside with SBS 2011

I have a brand new out of the box Dell PowerEdge T310 running SBS 2011. Our employees at our remote offices can't send emails to recipients outside of our own domain. The workstations at the same ...
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2answers
2k views

Postfix refusing to relay mail from local client

I'm trying to get a python script to send mail (using smtplib.SMTP), but postfix is refusing to relay the message. I don't use the Ubuntu 10.10 Virtualmin server as a mail server (I happen to use ...
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2answers
4k views

how to use phpList with external (3rd party) SMTP servers

Like the title says I am trying to have phpList on my server and relay the messages through 3rd party service (e.g. TurboSMTP.com). I am having trouble finding any setting in the application or in any ...
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2answers
2k views

Recommended MTA for Windows Server

I need an mail server running on my web server that will just route email through other email servers. Exchange requires Active Directories which just complicates an otherwise simple setup. What are ...
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1answer
110 views

Exchange 2010: Send emails via STMP with custom From address to outside the domain

The requirement(s): (1) Connect to Exchange via STMP and (2) basic authentication and send emails with a (3) custom From address to (4) recipients outside the domain. I was able to get (1) - (3) ...
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1answer
40 views

Postfix Relay Based on Recepient

What is the best practice when one has to implement this sort of ruleset in postfix? Email sent to a@example.com, b@example.com, etc ought to be relayed to smtp.a.example.com. Email sent to ...
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2answers
518 views

Allow outgoing mail without authentication in MS Exchange

We have a legacy application that needs to send notification email to users using SMTP. It runs on a dedicated server with static IP. It has configuration for SMTP USer and SMTP Server IP, but no ...
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2answers
1k views

Problems sending email using .Net's SmtpClient

I've been looking through questions on Stackoverflow and Serverfault but haven't found the same problem mentioned - though that may be because I just don't know enough about how email works to ...
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1answer
267 views

relay_domains seems to be ignored by postfix

I am trying to set up a perimeter spam and malware filter using CentOS/Postfix/SpamAssassin. Unfortunately, I am still stuck on the PostFix part. I've setup a new subdomain DNS with its own A/MX ...
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1answer
1k views

DKIM on postfix relay server

I have a postfix/amavis relay server, with the domain name mail.example.com. It will be a relay for dozens of VPS's, which will have domains like hostname.example.net. So i have actually two ...
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2answers
214 views

SMTP relay restriction radio buttons disabled

I might just be doing something really dumb, but the two radio button options for my SMTP server relay restrictions are disabled and I have no idea why. I've included a screenshot below to help ...
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1answer
3k views

New mail server can't send emails, only receives

I'm setting up a new mail server for my company with Ubuntu Server 11.04 and postfix/dovecot. I'm new on this so I have some problems. I'm getting it works only for receving mails from any address ...
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1answer
220 views

Qmail with AUTH CRAM-MD5

My Qmail install on Centos5 has CRAM-MD5 installed. I want to use this to an authenticated SMTP relay. Where do I specify the username and password details for QMail?
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2answers
3k views

Sendmail relay authentication

I'm trying to set up my sendmail to authenticate against a relay (comcast). I'm not seeing any attempts to authenticate at all. I'm trying to just debug how authentication works, and can't connect all ...
1
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3answers
386 views

Recommended SMTP Relay Service [closed]

I've got a legacy application that needs an smtp server to relay emails. Each client has various control over their IT infrastructures (from little to none at all), so I can't necessarily install an ...
1
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1answer
319 views

Setting up SMTP to receive mail

Thanks to a post on StackOverflow, I was keen to discover that I can set up SMTP in IIS6 to receive mail on my Windows 2008 server. However, I'm having a bit of difficulty as my test email results in ...
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2answers
3k views

Postfix relays via gmail, FROM email is wrong

I recently set up a home-server. And since my ISP quite annoyingly blocks outgoing port 25 I can't setup the SMTP properly. So I set it to relay via gmail(I don't send a lot of mails by this server ...
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1answer
560 views

SMTP Connector for SBS 2008 (1and1 and rogers are not working)

I need an SMTP connector for my SBS 2008 server. The Domain/DNS is registered with 1and1 but due to recent issues they are being blocked by a lot of servers now. 1and1 also does not give me enough ...
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1answer
508 views

Unable To Relay

I have a 2003 Windows SBS that I have just setup users POP Connectors to get their mail into the Exchange 2003 Server (on the same box). I am able to receive email fine, but can't send email out with ...
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4answers
215 views

SMTP server requirements

Could someone help answer a few questions regarding the networking / DNS requirements for an SMTP server? Assume the server is setup already. Is a MX record required for SMTP? TCP port 25 open to the ...
1
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1answer
200 views

How does mail server know what kind of client it's authenticating?

My cloud-hosted java app successfully authenticates to our mail server on another host (a managed VPS) at mail.example.com. The server at mail.example.com accepts email to our users at ...
1
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2answers
484 views

mail relay for multiple domains

Is it possible to configure a postfix (or any other mailprogram for linux) in this way that it is able to recieves/send mails from and to multiple internet mailserver and deliver those mails to local ...
1
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4answers
16k views

Exchange bouncing email sent by Outlook

We are trying to move users off Exchange 2007. Following various guides online, we've changed our Accepted Domain to be "internal relay" and created a "Send connector" to relay unhandled email for our ...
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1answer
281 views

SMTP Connector Settings

I’m looking for info on setting up an SMTP connector to accept all mail sent to the server (MX20) for a domain, hold it and forward it onto the primary Exchange server (MX10).
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1answer
842 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 ...
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1answer
2k views

Sendmail - Relaying denied (state 14)

I have my sendmail.cf file configured to send local mail and to receive external mail to local users. So sending mail from the server to the external world works fine, but the other way around does ...
1
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1answer
485 views

Postfix After-Queue Content Filter, advanced filter not working

I followed the instructions in the postfix website on how to setup a content filter, I got the simple example up and running fairly quick, but after long hours of struggle I couldnt get the advanced ...
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1answer
40 views

What is the correct way to get an NDR to be sent when a bounce back occurs?

I have a user who developed a WebApp that sends SMTP messages. Users are able to reply to the message using a MUA (outlook, whatever) but there is no NDR if the user doesn't exist. I suspect that ...
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1answer
293 views

Dual delivery Google Apps and Postifx (server reject mail from my domain on google)

This is the scenario: I have a server with Postfix and some domains, and now, one of this domains want to use Gmail Google Apps only in a couple of accounts. The end-user configure the domain with ...
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1answer
620 views

How to forward to dynamically determined addresses with Postfix?

Each message to a local user must go to an address that is obtained by running an external command. That command will look at the local address tag, make API calls to several processes, and then ...
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1answer
174 views

IIS SMTP server sending emails multiple times

I am having a problem with the SMTP server on a Windows server 2008 box. Every Thursday morning, the server decides to send the same 2000+ emails to the same person. There is nothing in the code ...