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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How to read the “MS ForeFront” antispam report in email header?

I'm trying to diagnose why emails I'm sending out from my server's IIS SMTP Pickup Folder are getting bounced back occasionally. One tech from a receiving company who couldn't receive the emails ...
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3answers
185 views

Exchange 2007 - One server set-up

I'm trying to set up Exchange 2007 with just one server (not the Transport + Hub configuration, just a Hub). I installed the server with the Hub Role, and it's not accepting SMTP. I changed SMTP so ...
3
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2answers
737 views

How to copy outgoing messages on sendmail

I've searched the serverfault and Google, but did not find anything related to my question yet. So, I have a customer that wants to read all emails sent by his employees. I've configured a VPS with ...
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1answer
1k views

Flood of traffic on port 25

I am getting thousands of hits on port 25, over 400,000 connections in a day. I am using sendmail default settings on Debian 7. Mailserver is not configured. Please see below Nginx access logs ...
3
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6answers
683 views

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 ...
3
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1answer
63 views

SMTP errors with iOS devices

I'm trying to diagnose why when an iOS device like an iPhone or iPad is set up to use email with our server for the first time, these errors occur. We choose "Other" from the initial set of choices ...
3
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2answers
21k 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 ...
3
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2answers
287 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 ...
3
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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 ...
3
votes
1answer
9k 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. ...
3
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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 ...
3
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2answers
86 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 ...
3
votes
3answers
4k views

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
323 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
695 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
3
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4answers
301 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 ...
3
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1answer
167 views

Port25.com SPF test fails, gmail SPF pass

When testing my SPF record using port25.com's nifty little tool by sending an email to check-auth@verifier.port25.com I get the following FAIL result: ...
3
votes
1answer
400 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 ...
3
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6answers
2k views

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 ...
3
votes
2answers
540 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 ...
3
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2answers
1k 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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votes
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 ...
3
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1answer
300 views

Does closed Port 25 cause mail to be marked as spam?

I have a web server where I have installed Postfix for sending emails only. All incoming mails will be handled by google apps and not my web server. Using iptables rules, I have blocked all incoming ...
3
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2answers
9k views

Postfix - Host or domain not found

I just installed Postfix on my ubuntu, on a local network. On this network, I have an Exchange Server (using domain mail.example.com). I had a problem sending an email to a local address : ...
3
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1answer
1k 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 ...
3
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1answer
5k 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 ...
3
votes
2answers
453 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 ...
3
votes
2answers
945 views

Amazon SES vs EC2 Smtp server

We have an existing smtp environment setup in an EC2 instance which is used to send Transactional emails like password reset. Now we have a requirement to send System emails to a large user base in ...
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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1answer
845 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 ...
3
votes
3answers
292 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 ...
3
votes
1answer
110 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 ...
3
votes
2answers
632 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 ...
3
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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 ...
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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 ...
3
votes
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 - ...
3
votes
2answers
284 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 ...
3
votes
2answers
6k views

How to setup a Postfix SMTP-only for multiple domains

This is my first question on Stacks. I always read a lot of solutions to problems here almost every other day. So thank you to all contributors. I am a noob here so please spare some space if I am ...
3
votes
3answers
4k 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 ...
3
votes
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
60 views

Postfix SMTP relay server

I use gmail to receive e-mails both from my gmail address and my own domain, but gmail no longer allows you to send e-mails from your own domain name unless you provide your own SMTP server to send ...
3
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1answer
279 views

What does an empty AUTH EHLO SMTP response mean with MS Exchange?

I'm a programmer, not a sys-admin, but my customer's sys-admins are not being helpful and after much googling I still can't find the answer to this. My Java application gets the following response ...
3
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1answer
146 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
398 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 ...
3
votes
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 ...
3
votes
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, ...