SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

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Postfix mail gateway/relay for limited domains

I have a number of servers at a hosting space. What is the best way or is it possible to run a relay on one of the system to send all emails to alerts@myowndomain.com to our email hosting service ? ...
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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 ...
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0answers
559 views

IIS 6 Smart Host Outbound Security

I'm using the IIS 6 smart host setting to forward all email sent through IIS to SendGrid. It works fine if I set the Outbound Security and smart host settings at the top level of the Default SMTP ...
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1answer
23 views

rDNS for SMTP server locally with Mail hosted by third party

Ok We have a difference of opinion on something and wanted to get some expert advice. We host our mail with our main domain "OurDomain.net" with a third part mail provider. We have an in house ...
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1answer
3k views

How to make Postfix able to send message to the world?

I'm configuring a SMTP server based on Postfix with PostgreSQL. When I try to send a mail to another domain I got a Recipient address rejected: Access denied error. Here is my configuration : # ...
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1answer
141 views

Postfix as a relay for specific networks only

I have a strange issue with postfix that is driving me a little up the wall as it seems to work 50% of the time but with no changes made. What I want to achieve: I have a number of virtual servers ...
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1answer
963 views

let CRON send emails through SMTP ( debian squeeze )

i would like to send emails whenever a cronjob has completed, i read that this is possible with exim4. in /etc/alias i added the line myuser: mygmail@gmail.com in /etc/exim4/update-exim4.conf.conf ...
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2answers
605 views

Gradually migrate from one SMTP server to another

I maintain an application that sends out a ton of e-mail on a daily basis. Soon, we will have to migrate to another SMTP-server for that, which has an ip address that has no reputation with respect to ...
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1k views

Postfix MySql Dovecot - SMTP Authentication Failure

Hello I have a Postfix setup with Dovecot and MySql. The server is running Debian Squeeze. The MySql server is a slave that has data pushed to it from a primary (postfix) mail server(running a ...
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1answer
601 views

Is null return path reliable indication of a bounce?

I have a mailbox that receives bounces as well as normal email (the latter includes messages from automated services). I want to filter out the bounces and forward them to another mailbox. Assume I ...
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1answer
208 views

Postfix: Ignore relay host when from specific address

I configured my postfix server to relay all received mails to smtp.example.com with relayhost. This server doesn't accept mails from an external source. So only scripts are sending mails. Is it ...
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3answers
235 views

Send email from different domains to different external IP's on a single server

I have set up a windows 2008 R2 server to route email from Exchange 2010 using SMTP Server in IIS. I have 3 seperate domains and would like to route each one through a different internal and ...
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299 views

SMTP Service crashes on Windows Server 2008 R2

on a Windows Server 2008 R2 machine the SMTP service crashes without generate any event. I Set the service to restart when it fails but it doesn't. How could I face this problem? Is a common issue? ...
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1answer
409 views

How to test SMTP email sending capability, locally?

I need to test SMTP email sending capability that I just added to my java app. So far, I only tested it using my private Gmail account. It works fine. Now I would like to test various settings: SSL, ...
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4answers
7k views

Is greylisting still an efficient method for preventing spam?

I've used greylisting on my servers for many years, but I don't know how effective it is nowadays. Is it still good for fighting spam in 2012? Or is the typical spammer MTA capable of resending ...
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1answer
837 views

Emails sent from Coldfusion using the same SMTP/Exchange server works from one machine but fails for another

First, apologies if this question is too vague or has too little information to really be answerable. I am not normally working with these issues, and I don't have full access to the environment. ...
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2answers
199 views

How often do MXLogic lists get updated?

Some domain refused to accept email from my domain due to MXLogic filtering. I've sent an email to falsepositives@mxlogic.com and they responded promptly that they changed their records. Question: ...
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1answer
1k views

Postfix enable sending to any domain in the Internet with authentication but no SSL

When I try to send a mail by SMTP and Postfix I got a error "5.7.1 unable to relay". After lot of config changing it worked for me to send email to the same domain as server (to other accounts on ...
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2answers
613 views

IPTables Rule for Google Apps SMTP

I am trying to add iptables rule to allow traffic on ports 465 & 587 to google apps smtp servers. But I got not luck. My WHMCS installation works fine with google apps when I turn off iptables but ...
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2answers
523 views

Creating a “fake” open relay to capture non-relayable outgoing mail with postfix

We occasionally have customer-provided servers in our technical support and engineering departments. They're isolated on their own VLAN, with strict firewall rules in place to minimize possible bad ...
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2answers
236 views

Is there a common X-Header for RFC 2821 “MAIL FROM”? Should it be DKIM signed?

w.r.t. the difference between RFC2821 MAIL From and RFC2822 FROM I'm considering having my MTA add a header specifying what was sent in the MAIL FROM portion of the envelope. The RFC2821 header is ...
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1answer
917 views

SMTP Relay via MS Exchange

I am trying to pragmatically send e-mail to external user with Exchange. Now I know if Relay is not Enabled in Exchange Server then e-mail relay will not work. Now, if I send e-mail from my Outlook ...
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1answer
341 views

Does DKIM works with subdomains?

ISP's recommend you segment your marketing and transactional emails by using different IPs. I want to start using DKIM, but since DKIM is a domain based reputation system I wonder if signing with the ...
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1answer
6k views

Zimbra ZCS 7.2.1 MTA Deferring e-mail

Zimbra 7.1.2 and the MTA seems to be deferring e-mail when it is received. Oct 1 09:35:42 www postfix/error[16614]: 5FB8C1A803EE: to=<xxx@xxx.xx>, relay=none, delay=0.15, delays=0.08/0.01/0/0....
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2answers
2k 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 to ...
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1answer
2k views

How to get php mail function to work on Debian “squeeze”? [duplicate]

Possible Duplicate: Getting PHP mail() function to work on Debian Lenny I have installed Apache and PHP5 on my debian server. Firstly I tried it using sendmail. Here is the step by step ...
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2answers
1k views

Using nc.exe (NetCat) to send emails to secured SMTP server (TLS)

I used to send emails to unsecured SMTP servers using nc.exe utility (Windows port of NetCat) and now I need to send the same emails to a secured SMTP server (TLS). What additional parameters do I ...
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1answer
148 views

Set postfix to send email but not to receive them

I'm using Google Apps to handle personal email addresses for my domain name, and I set up the DNS as Google suggests. All works fine. Now since I need a SMTP to send emails from my e-commerce I ...
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1answer
382 views

Handling emails on a web server - Making sure the FQDN is set correctly based on the website sending the email

I have a Windows 2008 Web Edition server hosting multiple websites using IIS 7.5. At the moment, all the emails are sent via the IIS6 SMTP service. The FQDN of the SMTP service is set to the computer ...
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1answer
767 views

Thunderbird 15.0.1 cannot use Exchange 2003 SMTP

I'm having the strangest time getting a Thunderbird email client to connect to my Exchange 2003 server. I got the incoming IMAP account set up no problem, and I can receive mail. However sending mail ...
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1answer
2k views

Create a mailbox in qmail, then forward all incoming message to Gmail

I needed to let PHP send mails from my webserver to my web app users. So I installed qmail on my Debian server: sudo apt-get install qmail I also updated files in /etc/qmail specifing my domain ...
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1answer
131 views

Mail to SMTP Server via Exchange

The title already says much; I want to send mails with an adress ( test@something.com ) Until we got our Exchange-Server, we were recieving via POP and sending via SMTP. The office (4 People) wants ...
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4answers
287 views

My server won't send emails

I've been sent here by the people at stackoverflow OK so I know I'm using the right code becuase I have it working on another server but when I try to send an email from a webpage on this particular ...
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2answers
462 views

Postfix SMTP server issue

So I have an Ubuntu Linux box machine for my website. (not ran locally at home, it is a public linux box). But for some strange reason I can only send Email from my home machine to this box in outlook....
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1answer
3k views

Sending emails with Thunderbird + Postfix + Zarafa does not work

I installed zarafa on my vserver and use as MTA postfix. The webaccess works fine, I can revceive and send emails, also receiving mails with thunderbird (IMAP ssl/tls) works. But there is a problem, ...
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1answer
117 views

DKIM sign any outgoing mail as the same domain. is possibly?

I have a website, and the users recommend via email to another persons, so the mail come from my site, but I need to appear the user as sender, but "via" mydomain. The logically and what lists ...
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1answer
9k views

How the Postmaster@domain address works

I'm very new to Exchange (in fact, an apprentice and studying it at the moment) and am wondering how the Postmaster@domain.com address works. An example: A smarthost configured with one mailbox, ...
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1answer
2k views

Cannot send email outside of network using Postfix

I've set up an Ubuntu server with Request Tracker following this guide (the section about inbound mail would be relevant). However, while I'm able to send mail to other users within the network/...
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2answers
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Dealing with SMTP invalid command attack

One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp ...
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1answer
131 views

Block SMTP by iptables except locally

Can you help me with iptables. I want to allow send emails locally on server, and forbid to send anywhere else. i made some changes in iptables, but without success. I have CentOS. Only rule that ...
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1answer
1k views

Using 1and1.com Servers, SMTP Mail is Limited - Local XAMPP Server Works As Expected

I'm starting to not like 1and1.com that much. I've used them for years, but mainly for simple sites without much need for configuration. I know there are better hosting companies out and I may go ...
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4answers
12k 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

postfix and iRedMail- Relaying Denied

I am trying to setup iRedMail and am way over my head here. I have installed it, and can send emails internally, but not externally. When I send an email from outside, I get the following return email:...
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1answer
2k views

postfix with mailman [closed]

What should happen is that user@dur.bounceme.net should be delivered to that users inbox on localhost, user@localhost. Thunderbird works fine at reading user@localhost. I'm just using a small ...
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2answers
1k views

Simple SMTP relay with whitelist

I've got a test instance of a compiled web app (that I didn't write) which I'd like to do some testing with, however the app contains client email addresses that I would like to not receive emails ...
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1answer
1k views

DSN Service Unavailable

I am having trouble with a newly installed server that we have just migrated to. I am running sendmail and cannot send mail to a specific domain. Mail everywhere else appears to work. Logs say: DSN: ...
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1answer
252 views

What is the failover logic when SendMail is smarthosting to a FQDN with multiple A records?

CentOS 5.x | SendMail This is somewhat related to my other question about round robin but as it's more general, I thought I'd separate it out. If SendMail is smarthosting to a FQDN with multiple A ...
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2answers
5k views

Problems opening port 465 for smtp on centos

I'm using phpMailer to send off purchase confirmations using a google apps address/smtp. The whole thing was working great on the development box, but now that it's live, it seems that the port I'm ...
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1answer
5k views

SMTP authentication failure + PAM-MySQL cannot authenticate

I am building a mail server using Postfix, and set up the authentication to check against a database set-up using Postfixadmin. I can authenticate via Courier IMAP okay, as it can authenticate ...
2
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2answers
629 views

How do I log tls-encrypted smtp traffic?

I'd like to know what my local postfix says to the Amazon SES smtpd after the STARTTLS. In plain text, so I can understand it. Amazon SES requires TLS, so I can't temporarily turn it off. I currently ...