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

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2answers
184 views

SMTP / HELO and RBL black listing

We've been having many issues with our external IP address being put on RBL's and blacklisted. We are using a 3rd party, hosted SMTP e-mail and we have two locations using it. Our TLD is ABC.com. ...
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1answer
3k views

POSTFIX bouncing when destination is my domain

I am using provider mail hosting to send emails. On my Webserver I also have Postfix running and configured. Here is my main.cf smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no ...
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3answers
7k views

Sending mail from Postfix via Gmail: unable to get local issuer certificate, certificate not trusted, No worthy mechs found

System specs CentOS 5.5 Postfix 2.3.3 Scenario I've been following Configure Postfix to send/relay emails Gmail (smtp.gmail.com) via port 587 to try and get the connection between Postfix and ...
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1answer
287 views

Open Relay for internal IPs

How do I enable SBS 2008 and exchange to send mail via SMTP without authentication? I have a handful of network scanners that don't have anyway of configuring SMTP authentication. So I want the ...
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3answers
606 views

What are the pros and cons of using Microsoft's own SMTP server versus a third party one?

I need to setup a SMTP relay for some web applications that need to send email to its users. I've used hMailServer for that task previously, but I'm thinking of switching to IIS SMTP Virtual Server. ...
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7answers
5k views

Postfix open relay

Greetings, Google says that I'm originating too many emails from my IP. Since I NEVER uses this smtp to originate emails, I suspect my postfix is somewhat misconfigured, so that I have an open relay ...
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2answers
186 views

How do I configure PostFix to allow phpmailer to send out email through it?

I have setup postfix on CentOS and trying to configure phpmailer with smtp authentication. Phpmailer will only work if i put 0.0.0.0/0 under mynetworks in postfix main.conf mynetworks = 127.0.0.0/8, ...
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1answer
163 views

SMTP server, remove port 25 for relay communication

I have setup a SMTP server in my internal network, but I want to remove the port 25 completely since my service provider limits access to port 25. However, even using port 587 in my server to ...
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1answer
521 views

Zimbra doesn't send mail via smtp relay anmore

our Zimbra-Server isn't working for outgoing external mail since yesterday. Friday I installed some updates (for shell shock and Kernel updates), restarted and it worked fine. But since yesterday ...
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1answer
139 views

sieve redirect to foreign email gets “Relay access denied”

I have a postfix mail server with sql authentication and I want to implement sieve on it. Sieve is working relative good, rules who contain 'fileinto' are executed perfectly. I configured a rule in ...
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4answers
2k views

Postfix setup on AWS EC2 using SMTP relay

On ec2 instance, the IP is dynamic, and if I want to use third party SMTP gateway such as sendgrid, what is the suggested values of the following fields? myorigin myhostname mydestination Assume ...
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2answers
665 views

Email not being relayed from EC2 Amazon Linux Instance

I'm trying to send email from my EC2 instance. Regardless of the target email address the SMTP service logs show that the email is sent but it never turns up on the remote server. I've done a ...
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4answers
6k views

Postfix- open relay. How to configure so it is not?

I have setup Postfix but am having trouble with the setup. Whenever I used to send emails to the server, it reject my mails saying 'Relaying Denied', so I changed the following in main.cf: ...
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2answers
1k views

Prepend X-header to all relayed messages in Postfix

I've got several production servers running a LAMP stack. They each have a local Postfix server catching any mail from the system and from PHP, and relaying it via a smarthost (the SendGrid SMTP ...
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1answer
351 views

Understanding sendmail logs

So yesterday we found out that one of our old pop servers had been hacked and was sending out spam. We promptly took care of the situation and it would seem that it's all taken care of. I've been ...
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votes
1answer
5k views

Allow certain IP(s) to send almost any e-mail through Exchange 2010

We recently migrated form Exchange 2000 (yes I know...) to Exchange 2010 and went through the horror of configuring it. First of all we don't use ForeFront, sadly(?) we can't. Before I ask my ...
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1answer
45 views

Postfix: sendmail (php-cgi) with different IP as authenticated SMTP Users

my Postfix-Mail Server is delivering two main types of mails Mail recieved from php-cgi (sendmail), localhost relay Mail recieved from authenticated SASL SMTP Users Is it possible to define a ...
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1answer
394 views

smtp relay attack on our mail server (not an open relay server)

Help, We put our Exchange Server (10.0.0.125) behind a SMTP Proxy server (Xeams if you have heard of it), however recently our client complaints we replies their email too late - and we found ...
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1answer
432 views

Capture virtual vagrant server smtp on my actual computer

I'm running a number of virtual servers using vagrant on my computer. This is working well. I have installed Postfix to send SMTP inside these virtual servers. But what I want to do is have Postfix ...
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2answers
4k views

SMTP -> ERROR: RCPT not accepted from server: 554 5.7.1 : Client host rejected: Access denied

I am trying to send mail through phpmailer with smtp.i am using the host which i am using on my outlook with same username and password.I am getting an error .can anyone help me how to fix this. My ...
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2answers
156 views

Same domain SMTP unauthenticated message relay [closed]

While I was doing some testing on an SMTP server I was able to successfully send mail from knownid@myserver.com to knownid@myserver.com through telnet without any authentication. From a risk ...
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3answers
936 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 ...
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1answer
140 views

Postfix - RBL check behind relayhost

We are running a mail server which is responsible for a sub-domain (say, dom1.example.com). All the mails sent from Internet are received through our relayhost (mail server responsible for ...
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1answer
500 views

postfix 550 relay not permitted for virtual mailbox domain

When somebody sends mail to myvirtualdomain.com I get the message Remote host said: 550 relay not permitted! [RCPT_TO] What is wrong with my settings? I do not think the problem is in the mysql ...
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2answers
1k views

PHP Mail Relay via Remote smtp Server [duplicate]

Possible Duplicate: How to configure php.ini with remote SMTP? We have a php application running on Linux which sends emails to there users. Currently its setup like php.ini is configured ...
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2answers
2k views

Allow receiving and sending of local mail, disable remote relay on postfix

I just installed mutt and postfix on my server and I've been playing around with it. Now, however, I want to make sure that no one can remotely send mail with my server as a SMTP relay. I don't know ...
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1answer
375 views

postfix specify limited relay domain while allowing sasl-auth relay

I'm trying to set up postfix to allow relaying under a limited set of conditions: The destination domain is one of a pre-defined list -or- The client successfully logs in Here's the relevant bits ...
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3answers
4k views

Mail not relaying in postfix

I am managing a server which mainly deals in relaying mail using virtual alias maps. For some reason unknown to me email that goes through these maps are getting bounced. I've checked to make sure the ...
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2answers
2k views

gmail smtp over sendmail

I've setup my sendmail to send mail using Google SMPT. However, I keep getting this error. Jun 20 11:35:24 server sendmail[2370]: p5KBZO3X002370: from=apache, size=1646, class=0, nrcpts=1, ...
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3answers
2k views

The server response was: sorry, relaying denied from your location - Windows Server 2008

I am finding a problem sending email from my .NET application. Server Error in '/' Application. Mailbox name not allowed. The server response was: sorry, relaying denied from your location [X.X.X.X] ...
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1answer
1k views

Problem sending mail “Client host rejected: Sorry, no xDSL here”

I'm trying to use SMTP on localhost to send emails thru a simple mailform in asp.net c#. For some reason all emails end up on the badmail folder. The .BAD file says: Final-Recipient: ...
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2answers
1k views

Postfix: multiple relayhost for 2 internet lines?

Following setup is going on: Firewall with 2 internet lines. Postfix is running as MTA. I have 2 ip's on the lan, 192.168.2.254 & 192.168.2.252 I would like to create the following situation: ...
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2answers
2k views

Virtual SMTP Server not relaying mail

In our LAN, we have a development box with IIS 7 that has an SMTP Virtual Server installed. All development applications send outgoing mail to this virtual SMTP server, and it in turn relays the mail ...
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1answer
39 views

Postfix: Handle different sender

I have currently the following Setup: Incoming E-Mails: Customer A -> Mailserver of Customer A All other Customers -> Default Relay For Outgoing E-Mails, I set up the sender_dependent_relayhost ...
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1answer
26 views

Default Relayhost and custom relayhost for domains [closed]

I have a customer which needs a custom relayhost for sending emails. So I want to choose this relayhost only for this domain. customer.example.com -> relayhost A (all other domains) -> relayhost B ...
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1answer
328 views

Postfix SMTP Server fails to send messages to anyone outside the domain

Here is the result of a recent test on my SMTP server, I just want this server to send emails which used to work perfectly upto about a week ago Resolving hostname... Connecting... SMTP -> FROM ...
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1answer
54 views

Postfix relaying to local instead of relayhost

I am trying a simple postfix relay of emails via an SMTP server. But I see from the logs that the mails are relayed to local and not to the relay host. The main.cf configurations are below, ...
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1answer
321 views

Transaction failed 554

I created mail server by this tutorial http://www.unixmen.com/install-postfix-mail-server-with-dovecot-and-squirrelmail-on-centos-6-4/ I can send emails to myself it works fine, but when I want to ...
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votes
1answer
51 views

How do I setup a Hub Transport Relay Connector in Microsoft Exchange 2003?

Preface I am employed by a software company and part of our program uses an Exchange server to relay email notifications. The program works as an SMTP client and must be able to send email to ...
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votes
1answer
276 views

cPanel Change SMTP send port [closed]

Our ISP blocks outbound port 25 (annoying) and we are currently paying for a relay service. One of our clients on the server is running a high traffic website and pretty much everyone who goes on the ...
0
votes
1answer
153 views

Postfix on two servers. Can I route all mail though just one of them?

I have at least two web servers which utilise Postfix to send mail from web applications. One is what I call the 'master' which will remain static and the other is what I call the 'slave', which is ...
0
votes
1answer
104 views

Having a local SMTP server to relay emails to my website's mail server

I'm working in a small company. We send our emails through company's mail server which is located (along with company's website) on a shared web host. Once in a while our Internet connection is down ...
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votes
1answer
2k views

Postfix with relayhost - relay access denied for bounces

I have set up a Postfix Mailserver, outgoing mail is being sent through a smarthost/relayhost which requires authentification. That works great, internal clients can send to foreign recipients though ...
0
votes
1answer
504 views

exim4 smarthost with sender verification

I'm trying to set up exim4 as a smarthost in front of the ISP mail server. Everything works fine, except from some emails coming from invalid senders (most likely spam). The ISP rejects them with 450 ...
0
votes
1answer
87 views

Hook into sendmail

I have an app on a server that sends mail via the local system's 'sendmail'. I want to write a program that takes the payload of the message, modifies it, and then sends it on to the original ...
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votes
2answers
361 views

Exchange 2013 Internal Relay via Smart Host

Thank you for your help in advance! I am currently setting up an Exchange 2013 server, to replace our old POP3/SMTP system, however we would like to roll this out gradually when convenient for our ...
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1answer
188 views

How to use sendmail to send mail as local user from remote computer and protect with password

I have a sendmail server running that currently only accept to send mail coming from localhost. Everything going out is masqueraded as @mywebsite.com and there is DKIM SPF MX and A record bound to the ...
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votes
2answers
3k views

How to configure postfix on Ubuntu to relay emails through Office 365 (SMTP) with TLS

I'm attempting to setup a postfix relay to our new Office365 setup for some internal devices on our network that require this specific setup. I've been trying various sites with configs and ...
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1answer
60 views

What postfix does if it is unable to deliver a message?

If I send a message from postfixA -> smartHost postfixB -> smartHost postfixC -> exchange and only postfixC does MX lookup and it is unable to deliver the message no matter if it is a hard ...
0
votes
1answer
47 views

Will Email sent from a 3rd Party SMTP service get classified spam?

I have a web application that I developed. I was originally using the Google Apps smtp servers for the outbound emails generated from the application for user notifications. As use increased Google ...