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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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What is the difference between defer and deny in Exim?

I understand that 'defer' is returned if a test cannot be completed, for example when a DNS blacklist lookup times out. But what effect does defer have on the final ACL decision? Also, what happens when I manually set the return to be 'defer'…
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IIS or Exchange Appropriate for High Volume, High Performance SMTP Mail Delivery?

A municipal client needs to put in place a email delivery system which is capable of quickly alerting their users via email. We estimate about 10 alerts a day. Each alert will be sent to 1000 recipients. The main issue is that the alerts need to be…
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Ubuntu: mailserver + database

I want a mailserver on Ubuntu that saves e-mail in the database and uses users in the database to let them login into the POP server and SMTP server. There are also different domains. How can I do this? Regards, Kevin
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Does anyone out there know how to install and manage an SMTP service on a machine that runs Windows VIsta?

I am working on a php program which would allow a user to enter information in a form and then send that information to a particular email address. I've been told that you need to have something called an SMTP server installed on your computer to…
user717363
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Ubuntu: mailserver + database

Possible Duplicate: Ubuntu: mailserver + database I want a mailserver on Ubuntu that saves e-mail in the database and uses users in the database to let them login into the POP server and SMTP server. There are also different domains. How can I do…
Kevin
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Multipart messages from postfix go to spam in gmail/hotmail

I'm new here and I'm sure this question has been thrown around a lot but I just couldn't find a solution. I have a networking website I've setup and we need to send notification mails to our members depending on activity related to their…
Swimfan
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Postfix+Dovecot+saslauthd can't recieve email from external domians

On my Linode I followed this doc to setup a mail server. Now I can send email to any domain but can't receive from other domains! I mean 001@mydomain.com can recieve from 002@mydomain.com but can't recieve any mail from xxx@gmail/yahoo/...com. I…
Amir Latifi
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How do I fix an "invalid" SMTP server issue?

Note: Domains and IPs obfuscated for security. We have an internal web application that sends e-mail reports out to various vendors. Our primary exchange server (domain name co.XXX.YY.ZZ) does not relay mail, so one of our web servers (Windows…
Dillie-O
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Postfix smtp relay with mysql autentification. How to?

I have a Centos 5 mail server setup with postfix and dovecot (+ postfix admin). Dovecot autentification is trough mysql database (which is updated with postfix admin). Passwords are stored in md5. Now my smtp server is closed relay, I want to open…
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Configuring a Postfix backup server

I have a subdomain subdomain.mydomain with two servers server1.subdomain.mydomain and server2.subdomain.mydomain running CentOS 5.5. server1 runs a Postfix server for subdomain.mydomain that acts as a second level SMTP server, i.e., it does relay…
Genba
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Setup email address forwarding on Windows 2003

NB: This server has SMTP installed, Exchange is not available to be installed on this box. I'd like to set up a server to accept email for one domain. e.g. emails sent to 12345@acceptdomain.com and then reroute these emails to a different domain…
Christopher Edwards
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How to get rid of messages addressed to not existing subdomains?

I have small problem with my sendmail server and need your little help :-) My situation is as follow: User mailboxes are placed on MS exchanege server and all mail to and from outside world are relayed trough my sendmail box. Exchange server -----…
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Postfix connect timing out remotely, working fine locally

Running Postfix on Debian I cannot connect to send mail any more. It worked until approximately a week ago. I do not recall touching the configuration of the server during that time, which makes it difficult for me to find out what the problem…
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What SMTP port threats to protect against?

I'm planning on creating a simple SMTP Server to auto parse incoming emails to integrate into an application. I chose this method over polling a pop3 account so that I can get instant notification. Not knowing a whole lot about server protection, I…
Matt Brailsford
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How do I set up SMTP on Windows Server 2003 to forward all emails to a given address?

I'm setting up an internal SMTP server to handle software tests which involve the sending of emails. I want to configure the server so that any emails sent to myinternaldoamin.com get relayed (is that the correct term?) to our real/main SMTP server…
Andrew Bullock
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