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Questions tagged [smtp]

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.

Some characteristics of SMTP (Simple Mail Transfer Protocol):

  • The default port is TCP port 25 and new submissions (MSA) is port 587.
  • Although depreciated, some services still use port 465 (SMTPS) to support legacy applications.
  • It is used to transmit outbound mail, and mail servers (which listens on port 25) receives mail on port 25.
  • It should not be confused with POP3 / IMAP which is an actual store for the e-mail. SMTP messages are received by the receiving server and then an MTA moves it to the POP3 / IMAP mailbox where it is normally retrieved using a POP3 / IMAP client.

See Also:

RFC5321

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Mail smtp server configuration for PHP and RHEL

I'm running WordPress on an intranet VM and I need all outgoing messages to reach a remote smtp server. In php.ini there is this specification: [mail function] ; For Win32 only. SMTP = localhost smtp_port = 25 But my site is running on RHEL so…
AlxVallejo
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SMTP server force outbound traffic

I'm having some trouble with setting up a SMTP server on a windows server 2003 machine, while trying to send emails using PHP through the internet, but to domain email addresses. Common info: Machine has Windows Server 2003 Server Machine on a…
acseven
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SMTP server configuration changes for Ubuntu 9.10 (Karmic Koala)

I will start to say that I am cough a MS dev and not a sys admin so please go easy. I have a server on the cloud that runs Ubuntu 9.10 (Karmic Koala) and is just a mail server. A lost friend of mine set this up for me, all works fine and it has…
Rippo
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Configuring E-mail server to allow review of each outbound email

I want to have a separate person reviewing the style of outbound e-mail correspondence sent by new employees. We have an MS Exchange in our organization, but I can look into any e-mail server system that would be able to allow me to implement such a…
Maxim V. Pavlov
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What is the difference between the sendmail submit queue and standard queue?

I'm confused on the purpose of the sendmail submit queue (by default /var/spool/clientmqueue). I think it's used to store messages when sendmail is ran in mail-submission program mode instead of daemon mode... but that's still confusing.
Mike B
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What is the role of the "generating server" and/or "Reporting-MTA" in an Exchange NDR?

I'm a little confused on what exactly the "generating server" does in an NDR. For example, I got the following NDR back when sending to a specific domain: Diagnostic information for administrators: Generating server:…
Mike B
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Postfix unknown command

I'm running two milters on my current postfix installation. I'm noticing that, from one particular client, they are sending an invalid command consisting of the first 3 letters of their domain name. When postfix sees this, it causes my milters to…
Larry G. Wapnitsky
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do not require smtp authentication for a specific domain using hMail server

One of my clients has a needlessly complex e-mail setup for a couple of domains, which is causing problems when they try to send e-mail between them. They have a couple of domains where mail follows a slightly weird path: Users connect to an…
toryan
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Ruby on Rails application throws SMTP Authentication Error

I'm developing a Rails app which when I run it locally, it's able to send emails through a gmail account via smtp. When I moved it to my server, it comes up with the following error for example when I try to create a new…
Spoons
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Configure Exim4 with Multiple Smarthosts

I'm using Exim4 version 4.76 and can't really find what I'm looking for - except if I don't understand how exim4 works exactly. I have configured exim4 as such that when we send an email from our web applications (which is on the same server as…
user114637
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How to make Zenoss stop monitoring SMTP?

The title says it all. We use Zenoss in a midsize network with lots of different Linux boxes. A lot of them have SMTP on by default, but we don't use it for anything; not on a single box. The Zenoss monitoring template "Status/IPService" keeps…
Zac B
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How to setup X-SID , X-AUTH & X-DKIM at windows server 2008 r2 with IIS 7.5

I am very sad that my legit emails drops to spam box while i receive many spam emails into my inbox. I very rarely send announcement emails to my all registered members (over 400k right now) but most of them dropping the spam box. I am right now…
Furkan Gözükara
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Receiving emails on CentOS 5, Postfix

Here's the problem : Our server (CentOS 5, Postfix) can't receive mails, bat can send. Running tcpdump port 25 and sending an email from gmail shows that there are incoming request from gmail But when i run netstat -nltp il shows that there are no…
BnW
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SMTP relay restriction radio buttons disabled

I might just be doing something really dumb, but the two radio button options for my SMTP server relay restrictions are disabled and I have no idea why. I've included a screenshot below to help illustrate. I'm using Windows Server 2008 R2. Thanks in…
Chris Kempen
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Configure IIS to send email from another IP

Frustratingly when I was setting email up I was sending test emails to my googlemail account. Now our IP has been blacklisted, all gmail emails end up in badmail with this notice: Final-Recipient: rfc822;xyz@gmail.com Action: failed Status:…
Tom Gullen
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