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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Monitoring incoming email server

What do people use to monitor that their email server is accepting external email? Most monitoring solutions send notices by email which is useless when incoming email breaks, so some other method of ...
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2answers
20k views

Easiest way to configure local SMTP server to relay through gmail on Windows?

We have gmail for our corporate email provider. I want to be able to send mail through smtp.gmail.com from ASP.NET. I have managed to do this just fine - and it has the benefit of all sent items ...
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2answers
256 views

Change or spoof outgoing SMTP server name

Having a strange problem here. We send out emails from a web application that use an SMTP server setup on a Windows 2008 R2 server. Everything was working fine but one of our customers changed their ...
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3answers
1k views

Has anyone used Amazon Simple Email Service (SES) and if so does it have standard SMTP configuration?

We want to use the more advanced features of Amazon SES such as their API for having better control and visibility over emails. However I also want it to work OOB with our current system which is ...
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3answers
1k views

Unauthorized email is sent using google apps registered domain

I have a domain name 2m.lt registered and added to google apps. There is an option there that all the email adressed to my domain (*@2m.lt) is forwarded to my mail email account (admin@2m.lt). Well ...
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6answers
2k views

Push email to a apache/php server

We've built a web service that needs to check constantly for email messages. Basically, an user sends us an email, and the server should make actions based on that email. We could use a crontab PHP ...
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2answers
84 views

SMTP: Which IP should I monitor?

I use a relay server to deliver external mails. I use relay server's IP in SPF record. But I'm not sure about blacklist monitoring/checking. Should I check main server's IP or relay's IP?
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2answers
5k views

postfix for sending emails thru php?

I want to install postfix (apt-get install postfix) to be able to send email thru php mail(); But i don't get does postfix needs an smtp to send emails or he can do it on his own? (because if it ...
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3answers
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Multiple PTR records

In your experience, have you found there to be any actual problems with having redundant PTR records (same name, multiple IPs) for a given host? Additionally, would you expect to see corresponding A ...
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2answers
311 views

How secure is our companies SMTP server if the PHP MAIL function can use it?

My company has just switched from having our e-mail hosted through a web hosting company to hosting it ourselves. I have been using PHP's mail function for forms on our website and because the web ...
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1answer
8k views

Postfix: How to make aliases work for virtual domains?

I'm trying to set up a local mailserver. I run Mac OS X Server 10.6 Snow Leopard, and it uses Postfix as server. I set the server up using the GUI and I'm doing all virtual settings via the terminal. ...
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1answer
651 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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4answers
293 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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1answer
2k views

Can't get SASL auxprop/sasldb working with postfix/Ubuntu 12.04

I have an Ubuntu 8.04LTS system running Postfix 2.5.1. On that system SMTP AUTH runs fine. The contents of /etc/postfix/sasl/smtpd.conf are: pwcheck_method: auxprop auxprop_plugin: sasldb mech_list: ...
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1answer
361 views

Change Outgoing SMTP port in Exchange 2003 with a slight twist

I feel like I should know this, but its been a long week already. I have a customer with an SBS Exchange server on their LAN. They currently have their MX going to Postini, who is then delivering the ...
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3answers
1k views

Sendmail : ignore local delivery

I've a Ubuntu webserver with Sendmail as my MTA Currently when i email outside my webserver's domain e.g. example.com to something like gmail or any other email outside the example.com domain it ...
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6answers
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What is causing email sent from my Google Apps account to bounce?

I have started to get Delivery Status Notification (Failure) messages in response to emails sent from my Google Apps domain account (at offby1.net): Delivery to the following recipient failed ...
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2answers
510 views

Set up an SMTP server that catches & stores all mail

I need to set up a SMTP server in a dev environment that will accept all mail sent to it (for any domain) and simply store it so we can later see what it has caught. What is the easiest way to set ...
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2answers
997 views

SPF Setup - Sending from VPS and Google Apps

In follow up to my question here, how on earth do I setup a SPF record?!? I understand that I have to add a TXT record to my DNS entries but what to put in that TXT entry is what's confusing me... I ...
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7answers
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What are the possible causes of this error: “Unable to > connect to ssl://smtp.gmail.com:465”?

I'm getting this error on my local machine when sending emails using (gmail's smtp + PHPMailer + CodeIgniter), which I wasn't getting on our previous office (we had to move offices). Severity: ...
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5answers
8k views

How can I set up sendmail to forward all mail to an external MTA?

We have multiple applications that currently talk SMTP to an external MTA. The emails have arbitrary destination domains (they're emails to be sent to our users), but all from the same internal domain ...
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2answers
349 views

Intermediate SMTP server (exim), how to handle backscatter?

I have a dedicated Ubuntu Lucid box at a hosting provider that is my backup MX (running exim4 4.71-3ubuntu1.4) for domains that I have configured on an Exchange 2007 server on my LAN. So my Exim ...
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1answer
815 views

DNSBL listed at zen.spamhaus.org - cant get outgoing mail working? Am I interpreting the response correctly?

I have problem with a mailserver and there is something I kind of not understand! I can connect, authenticate, specify the sender address - but when specifying the reciever i get a error 550 which ...
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3answers
2k views

How is LinkedIn able to send emails from my email address without getting flagged as spam?

When linkedIn sends and email to you about adding someone to your network, the email appears to come from this person's individual email address (not something@linkedin.com). To me it doesn't seem ...
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3answers
278 views

Does our IMAP access have to be behind our VPN?

I work for a small company (around 40 people) and our email is available via IMAP - but only when connected to our VPN. For iPhone users (and generally), the VPN connection appears to be an ...
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1answer
673 views

Force delivery retry without restarting the SMTP Service on Windows Server 2008 R2

I have a Windows Server 2008 R2 box hosting 3 virtual SMTP servers; vSMTP01, vSMTP02 and vSMTP03. The first two are configured to deliver all messages to dedicated smarthosts, while the last is set ...
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1answer
4k views

Google SMTP Error: 454 4.7.0 Too many login attempts, please try again later

I discovered that while it was possible to use Gmail/Google Apps as an SMTP server for scripted use, if too many emails were sent I started getting error messages: SMTP Error: 454 4.7.0 Too many ...
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1answer
108 views

empty EHLO from all around the web, is it a bot? [closed]

I've been getting this since a few weeks ago: Transcript of session follows. Out: 220 www.example.com ESMTP In: EHLO Out: 501 Syntax: EHLO hostname In: HELO Out: 501 Syntax: HELO hostname ...
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1answer
299 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 ...
3
votes
1answer
871 views

postfix misconfigured: “mail for (domain) loops back to myself”

I've just installed postfix on my debian system, so I have a default configuration, apart from the following values in /etc/postfix/main.cf: myhostname = mydomain.com alias_maps = hash:/etc/aliases ...
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2answers
588 views

Can Exchange 2010 Re-Route Outbound Messages Based On X-Header?

I'd like to know if it's possible to configure Exchange 2010 to read x-headers from an outbound message (say, user@internaldomain.com to user@yahoo.com) and then re-direct the message to an alternate ...
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1answer
3k views

Dovecot - Unable to receive mail - Fatal: Plugin 'sieve' not found

Struggling to Dovecot/Postfix set up on Ubuntu 11.10, Dovecot version: 2.0.13, Postfix version: 2.8.5 I can send outbound mail using the mailx command, but I can neither receive mail or send mail ...
3
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1answer
2k views

Turning on UFW stops my e-mail client functioning (both imap and smtp) even though they are allowed?

I am using ubuntu 10.04 on a VPS. Without enabling UFW everythign works fine - imap using port 143. And sends emails using smtp port 587. However, when I turn on UFW a lot of problems are ...
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2answers
2k views

Can't get SmarterMail to work on fresh Windows 2008 server

Really having trouble with this, I've been through all the guides I can find and get stuck, using latest version of Smartermail 8 on Windows 2008 with IIS7.5. I have it setup so I can SEND emails ...
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1answer
2k views

Exchange 2003 SP2 Mail Delivery Problem - Sending server sends QUIT command to EHLO response

So one of the Exchange 2003 servers I admin seems to be having trouble with sending e-mail to another domain's email server. As per my SMTP log (in NCSA format) this is what I have 66.195.209.243 - ...
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2answers
281 views

Exchange 2010 Setup

I am testing MS exchange 2010 SP1 for our firm. It's new exchnage installation as we don't have any previous versions. I installed Exchange 2010 with SP1 on Windows server 2008 SP2 (64-bit) with ...
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3answers
3k views

IIS6 Virtual SMTP server isn't coming back up automatically after a system restart

I've got a virtual server running Win2008 RC2. I've set up IIS6 with a virtual SMTP server on it to be the mail provider for the websites I'm hosting there. It all works great, but if for some reason ...
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1answer
2k views

How can I configure Exim to drop non-authenticated connections on alternate SMTP port?

I currently only allow connections on port 25 from a mail filtering service's IPs. I have Exim running on an alternate port for SMTP submission. This port needs to allow non-encrypted connections ...
3
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1answer
138 views

What does “domain or user is in the queue only list. Message queued” mean?

Emails to my domain are periodically being delayed. I see in Exim's log file /var/log/exim_mainlog messages like the following: 2013-05-16 18:58:18 1Ud77q-0002ns-Rd <= email@my.host.name ...
3
votes
1answer
356 views

Bash Script To Simulate SMTP Mail Receipt

How would I create a Bash script that simulates SMTP mail receipt and then drops the result into a Maildir-formatted directory (so that Evolution mail reader could read it)? I just thought it would ...
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2answers
2k views

Can't connect to SMTP server

I have trouble connecting to an SMTP server from my PC. I use Debian sid. telnet mail.example.com 25 Trying 12.23.34.45... telnet: Unable to connect to remote host: Connection timed out While from ...
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3answers
1k views

How to force Windows Server 2008 R2's SMTP server to generate NDRs for non-existing local users?

I have a Windows Server 2008 R2 server with the SMTP service enabled, which provides mail relay to another server for some applications. Sometimes, a message comes in with a wrong "To:" address, ...
3
votes
1answer
7k views

SMTP server not sending out any emails

I've installed SMTP service on Windows Server 2008. I'm attempting to send emails, however none get delivered. I've scoured logs for a long time, and have solved a few errors. Currently all emails ...
3
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1answer
823 views

Mail queue retry interval practices

I'm configuring a custom made mail queue. The thing is there can be errors sending mail. Normally, one won't know the reason why the mail didn't reach it's destination. So the most simplistic solution ...
3
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1answer
665 views

Can I configure Exim to log a given header of all emails sent?

I maintain a custom built web application. Any time this application sends an email, it adds a custom header X-UUID to the mail, to assist me in tracking abuse and email delivery. This UUID is written ...
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1answer
2k views

Preventing email blasts with Exchange 2010 IP Throttling (or any other technology)

We need to slow down the rate email spam is sent through the Exchange system from our developers' buggy applications. How can I throttle email messages in Exchange 2010 by Source IP, or sender, so ...
3
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1answer
782 views

What usually happens to a message when server returns SMTP Error 550?

What usually happens when a message recipient can not be found? Will it be deleted or archived on the (destination) server? In 550 case, will the message body be sent at all? Action: failed Status: ...
3
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1answer
181 views

Microsoft Hosted Exchange: Possible to outsource single mail account?

I have a customer who polls e-mail for a number of accounts in domain example.com via POP. Now they have a VIP user boss@example.com who wants to use Microsoft Hosted Exchange on his mobile phone. ...
3
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1answer
180 views

Redirect smtp, imap and pop to ssl

I want my users to stop accessing user accounts like IMAP, SMTP and POP without SSL. I can easily disable non-SSL access, but then everything would break. Is there a way to automatically redirect ...
3
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1answer
832 views

Help me understand Exchange and mail routing

The organization responsible for our mail infrastructure has recently embarked upon a migration to Microsoft Exchange. The group I work with has encountered some problems with the Exchange ...