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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Is it considered safe to send an email without using SSL?

I'm using a a plugin for Wordpress that allows you to configure outgoing email settings. The plugin works great. The PROBLEM is with my shared hosting account... it does not enable SSL. When new ...
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1answer
955 views

Changing HELO name in Exchange 2003

When I telnet to my mail server on port 25, I get the following: 220 myownmaiil.com My question is, how do I correct the spelling mistake in the mail? My mail server is Exchange 2003
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1answer
110 views

What is the best approach for setting up a good, secure smtp server on Debian?

Which server do you recommend? (postfix?) Which configuration for authenticating users for sending mail? Which setups for making it inbox friendly (dkim, spf, domainkey etc)? Is there some detailed ...
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1answer
819 views

Replacement for windows SMTP server that supports DKIM signing

Can you recommend a SMTP server/component to replace the SMTP service that is available in Windows Server 2008. I would like the SMTP server to support the same feature set as the built in SMTP ...
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4answers
6k views

SMTP relay through GMail overrides “from:” address with “[me]@gmail.com”

I've been trying to figure out if this is a new "feature" or if there is an issue with my configuration. I'm using Ubuntu 10.04 Desktop with Postfix as MTA. My smtp (as opposed to smtpd) ...
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1answer
271 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 ...
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1answer
1k views

Exim4 Smart Host Relay

I am running Exim 4.71. I want to: Route all email from A.com through mail.A.com Route all email from [B-E].com through mail.B.com Send all other email directly. Here is the configuration I have ...
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1answer
51k views

What ports to open for mail server?

I have just finished setting up a Postfix mail server on a linux (ubuntu) platform. I have it sending and receiving email and it is not an open relay. It also supports secure smtp and imap. Now this ...
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1answer
150 views

Looking for a simple free smtp server [closed]

I have a client looking for a decent free mail server for Windows 2k2 R2. They are looking at sending mail mostly but if receiving is possible that is a plus. I know that Windows comes with smtp but I ...
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3answers
816 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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1answer
105 views

Inconsistent SMTP Access

I have a mail server setup on Windows Server 2008. All was working fine, until I wanted to map a drive on the server so that I can access files on another machine. Windows prompted me to configure ...
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8answers
1k views

Incoming mail from sender, MX record won't accept replies. How to block the incoming SMTP connection from that sender?

I'm administrating a mail service for a small business. They have a mail host, foo.example.org, whose internet connection is an ADSL service with a permanent IP address. Unfortunately, many mail ...
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1answer
144 views

Protecting Windows SMTP service against the spam

I'm trying to use a Windows SMTP service on Windows Server 2008, but I can't understand how to secure it. Basically, if I keep Connection and Relay settings of SMTP Virtual Server to "All except the ...
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2answers
3k views

Exchange2010 has Private Machine Name and IP in outbound SMTP - How to remove?

We have a domain (domain.local) that has IP Addresses in the 10.10.10.* range. In the outbound SMTP server traffic, I see the internal machine name (exchange.domain.local), and the internal ip ...
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2answers
5k views

SMTP 552 4.3.1 Session size exceeds fixed maximum session size

I'm having a frustrating problem with one of our clients who is running an exchange SMTP server. I have an emailing component that is written in .net and I've specifically used Mono DLL's to ensure ...
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2answers
4k views

How do I send mail from Tripwire using SMTP?

I have just installed tripwire using Ubuntu repos and have gone into the configuration files and changed everything to what I want. When in comes to the options for SMTP mail method and the server and ...
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1answer
880 views

Why is my mail stuck in the queue with the status “retry” in Exchange 2003?

I have been having a problem recently where some of our mail is not getting to clients. I looked into the Message queue on my SBS2k3 server and noticed that several recipients are showing up in the ...
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1answer
915 views

It's possible to use google smtp for sending email from my server?

Well, I am becoming crazy to let my email deliver to gmail/hotmail from my new ip. Last year, i had no problems with my past ip, but now my emails go straight to the spam folder of gmail and hotmail. ...
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1answer
694 views

qmail questions - whitelisting and relays [closed]

My new server runs qmail, which I've never used before. There is no inbound mail on the server (all the clients have mail hosted elsewhere, but some systems on the server send mail. I'm about to move ...
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2answers
84 views

How faster is using an internal IP address instead of an external one?

I have a mailing list application that sends emails through several dedicated SMTP servers (running Linux Debian 5 and Postfix) in the same network of a hosting company. However, the application is ...
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3answers
3k views

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
534 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
3k views

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
259 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
22k 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
714 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
507 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
530 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
783 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
142 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 ...
9
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3answers
191 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
1k views

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 ...
2
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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
574 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
230 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 ...
2
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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 ...