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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Sendmail relay out of Amazon EC2?

I have a site running on CentOS 5.4 through Amazon EC2. Unfortunately, Amazon has had nothing but trouble with their entire IP range getting black listed from spam tracking services regularly. I need ...
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1answer
511 views

mail server administration

MY postfix does not show that it is listening to the smtp daemon getting mesaage below: The message WAS NOT relayed Reporting-MTA: dns; mail.mak.ac.ug Received-From-MTA: smtp; mail.mak.ac.ug ...
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3answers
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Postfix Problem (helo/hostname mismatch)!

I have a server, and it is running a error for one email only (all other mails in that domain are working). How can i fix it? (The error is above:) May 17 11:43:56 webserver ...
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2answers
247 views

Things to check for an internet-facing email server

I'm faced with the task of setting up a public-internet-facing email server, that will be relaying mail for all of our other servers in the network. While the software in itself is set up in few ...
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2answers
2k views

Send emails from shell script without local mailserver

How can I send email from a shellscript (usually cronjob) without running a mailserver on the same host. Using a smtp server. Running Ubuntu. I looked a t various tutorials, but couldnt find a ...
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1answer
221 views

Change smtp name

My question is probably very easy to answer but I have been struggling with this the whole day. Actually, I would like to change my smtp.mail name and account that is shown as sending the emails in ...
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3answers
3k views

Cannot connect to remote mail server for sending emails in ASP.NET

I want to migrate a web application from a Windows Server 2003 to a Windows Server 2008 R2. All works fine except sending emails from the application. If I configure the application to use the smtp ...
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3answers
2k views

Is sending email from EC2 / Rackspace Cloud a bad idea?

In this article it mentions that TrendMicro is now treating all emails from Amazon's EC2 as coming from "Dial Up Users": likely to be spam and this is creating severe deliverability issues with their ...
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1answer
48 views

Sending email from various domains

We are building hosted software service that is used by multiple customers. These customers want to communicate with their customers (end customer). So, today we send it from our domain: example.com ...
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3answers
223 views

Do busy smtp servers use long running tcp connections to exchange lot of mails?

I had this idea from http://stackoverflow.com/questions/2813326/maximum-number-of-bytes-that-can-be-sent-on-a-tcp-connection is it possible that smtp servers like gmail and yahoo enter into some form ...
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1answer
7k views

Best tool for Analyzing IIS 7 SMTP Logs

We're using IIS 7's SMTP service for sending out emails from our sites. I'm looking for a SMTP Log analyzer to make it easier for me to view the results and identify and problems (Blocks, Unauthorized ...
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4answers
20k views

How to open port 25 on the server

I'm using centOS. I want to implement a smtp mail server, and I have installed postfix and dovecot(both have been set correctly). I tried to telnet the 25 port, but it returns Unable to connect to ...
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4answers
709 views

Solution for when your website's emails goes into yahoo or gmail spam folder [duplicate]

Possible Duplicate: Dedicated Server emails ending up in Junk It turned out that the previous person owning this ip address that I currently have for my website had spammed a lot! so Yahoo ...
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4answers
2k views

Sending SPAM free mail through my website [duplicate]

I've been battling with this issue for couple of months. I need to send bulk mail (not spam) through my social network to users in situations like newsletters, site invitations (when user imports ...
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3answers
6k views

Reverse DNS does not match SMTP Banner

I had this Warning with mxtoolbox. I know that it's not necessarily a big problem, but since we are having lots of issue with email delivery, I want to check everything. I have a Exchange server 07 + ...
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2answers
3k views

Can't telnet localhost smtp

I'm trying to use telnet (debian lenny 5.0.2) to check behavior of a postfix installation, but I can't telnet to smtp. telnet localhost smtp telnet: Unable to connect to remote host: Connection ...
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2answers
6k views

how to trace an outlook mail not arriving to its destination when is sent to another domain?

I have an domain account configured with Ipower.com. If I use an email client such as Evolution, the mails arrive as expected. However if I use Outlook 2007 (as everybody in this company) the mails ...
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2answers
2k views

SMTP hacked by spammer using base64 encoding to authenticate [closed]

Over the past day we've detected someone from China using our server to send spam email. It's very likely that he's using a weak username/password to access our SMTP server, but the problem is that he ...
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1answer
471 views

Failed reverse DNS and SPF only when using Thunderbird!

I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address ...
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1answer
526 views

Difference between BSMTP and and simply forwarding an MX-record?

I am trying to understand the benefits of BSMTP, but must admit I do not quite understand the concept of it. What are the main differences between BSMTP and simply forwarding an MX-record? What is ...
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2answers
754 views

smtp server in iis6/ win2003 - how to prevent hackers/spammers from using it

Anyone have any checklist for securing the smtp server on my web server so no one else can hack it and send spam fro it?
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3answers
138 views

SMTP server problem

Our requirement is to send weekly newsletters to our website customers. For which we wanted to have local hosted SMTP server in our office. We are not using SMTP server provided by website hosting ...
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3answers
190 views

Name one good reason for immediately failing on a SMTP 4xx code

I'm really curious about this. The question (highlighed in bold): Can someone name ONE GOOD REASON to have their email server permanently set up to auto-fail/immediate-fail on 4xx codes? ...
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6answers
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How do you prevent spam being sent by your users?

So, for the third time in about two weeks (maybe less), one of our customers has had their password compromised, and a spammer was sending mail with their username and password using our webmail. As a ...
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4answers
1k views

Switch smarthosts in Exchange when using dual WAN

I'd like to know if it's possible to setup Exchange 2003/2007 to switch between smarthosts, based on the WAN connection currently in use. Example scenario: I have two WAN connections with different ...
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5answers
8k views

Virus sending phishing emails through exchange server

It appears that there is a virus on my network somewhere that is sending phishing emails through my exchange server. I can see the messages in message tracking and I see many SMTP errors for NDR's and ...
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4answers
312 views

Minimize the chance my email is blocked/filtered as spam

I'm running a web-based store where order confirmations are sometimes blocked and don't reach the intended user. The structure of the business model is such that our product is marketed to the ...
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2answers
528 views

How to change default sendmail SMTP error codes, responses, and/or DSN text?

CentOS 5.x - SendMail Hi Guys, I'm curious -- is there any way to customize the STMP error codes, response text, and/or DSN body text in sendmail? If so, where is this stored? Thanks, Mike
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1answer
228 views

My email server is blacklisted what can I do

I have discovered that my email server has been blacklisted by http://www.five-ten-sg.com What affect is that going to have on my sending and receiving emails and is there anything I can do about it ...
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1answer
1k views

Nagios test of smtp configuration

Is there a way of configuring a nagios check that a smtp service is correctly configured and emails are going out. I have a check that the service is running, but recently we noticed that the ...
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3answers
911 views

undeliverable email troubleshooting

I am using IIS6 smtp to send emails out, some of these emails are coming back with the following error. Could not deliver the message in the time limit specified. Please retry or contact your ...
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2answers
193 views

Multi-site email relay based on email address (in AD?)

We have a multi site setup currently based around Exchange 2003, but we are getting a lot of traffic over the vpn as only one server has an internet facing IP. Is there such a product that could sit ...
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1answer
97 views

Suggestions on mail servers [closed]

I got a app sending massive newsletters and so far I been using the regular smtp within the iis7. I been looking at mail servers and There are plenty out there and I wonder what your tips and ...
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1answer
123 views

Is it possible to have an SMTP login without a username, but with a password?

Sometimes, users of our software, which connects to SMTP servers, put in a password, but no username. (Or, rather, their browsers' autocomplete specifies a password, but no username.) Is there any ...
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1answer
1k views

Set up internal domain to use external SMTP in Exchange 2007

I'm moving to Google Apps and have setup dual-delivery. Everything is fine, but for mail sent internally (from sally@mydomain.com to john@mydomain.com), Exchange is not using the send connectors I ...
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1answer
449 views

Server and Application architecture for large outgoing email volume

we need to develop an application to send large amount of emails (newsletters) We estimate 15 millions of emails per month (6 - 10 emails per seconds). Would you recommend me the proper architecture ...
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1answer
1k views

Turn off SMTP on Windows 7

I have a large asp.net web application I need to run locally. The application has a large amount of email services and I want to make sure I don't send any email accenditally as I don't know all the ...
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2answers
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Sending lots of mails using SmtpClient (C#) takes very long after a while

I'm using this piece of code to send a mail: SmtpClient client = new SmtpClient(); client.Host = smtpServer; client.Send(mailMessage); If I trigger this code ten times/second, then after some ...
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2answers
1k views

IIS SMTP configuration gets reset?

LS, A few months ago I configured our recently acquired Windows Server 2008 server. I set up the IIS SMTP, everything was working great. However, a few days back the IIS SMTP server just lost it's ...
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1answer
94 views

Sending Mail from Web App to Google Apps won't work - internal routing? VPS

I've got a web application, www.mysuperwebapp.com, which sends out emails for various reasons - the contact us page is a good example. I am using google apps on the domain and I've setup a google ...
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3answers
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cant send using postfix from external ip address

i have postfix set up as a satellite to listen on port 587 i can send email outside fine trough the postfix(ubuntu) box from the local network with no problems when i try to connect to the ...
0
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3answers
150 views

Use one machine to send mail with 2 ip's

I need to config one SMTP server (sendmail) to send mail with 2 interfaces with different ip's depending server. For example: In same machine with to ip: 1.1.1.1 and 2.2.2.2 i need to send email ...
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1answer
901 views

Enable VRFY verb in Exchange 2007

Is there a way to enable the VRFY command on the Exchange server. I know this command is a security risk, but the server sits behind a firewall, and is not accessible from the internet. I would just ...
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1answer
1k views

using gmail to send mails from your php?

i've read some threads here in SO that someone managed to use gmail's smtp server to send out messages from php script. so if php sends a mail to peter@hotmail.com it looks like this: Alternative 1: ...
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1answer
125 views

using gmail as your email hosting provider?

i've got a external domain and i want gmail to handle all the incoming emails. i know that its free for me to let gmail handle all the outgoing mails, since you can add your external domain in their ...
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6answers
5k views

E-mail sent with postfix are marked as spam

I am using gmail as my email provider for a domain name that I control. I want to send email from my dedicated server that is being hosted by a real hosting company and I don't like the 500 message ...
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1answer
345 views

Web SMTP Server(foo.com) will not send mail to exchange server which is also(foo.com)

I think I understand this problem fully, but I do not know how to approach it or where to go in terms of troubleshooting. I've got my one domain http://foo.com that runs a Zen Cart installation that ...
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3answers
479 views

SMTP for multiple domains on virtual interfaces

The setup is like this (Ubuntu 9.10): eth0: 1.1.1.1 name.isp.com eth0:0 2.2.2.2 example2.com eth0:1 3.3.3.3 example3.com example2.com and example3.com are web apps which need to send ...
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3answers
215 views

How to distribute email's delivery between 2 or more servers

We provide Email Marketing service through our online App. We have about 30 customers. And each one has it's own mailling list (5k to 20k emails each). What we really want is to distribute email's ...
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1answer
285 views

How to limit SMTP delivery to hourly batches

Moved over from StackOverflow. Sorry if you saw it there first In an effort to keep us from being labeled spammers by major ISPs (in addition to SPF records, privacy policies, CANSPAM compliance and ...