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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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How to tell the address of the smtp server on my local Ubuntu OS?

I have tested and it seems I do have an SMTP server running locally. What I don't know is how to get its URL and login credentials. Any idea how to find those?
Genadinik
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Does Ubuntu have SMTP? If so, how can I see/edit configurations?

I am having issues sending email from my Ubuntu OS. I was told I should check my SMTP configuration. How can I do that on Ubuntu and is there such a concept on this OS?
Genadinik
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Stop Postfix revealing final email forwarding address in bounce messages

I have a Postfix server that receives mail for virtual aliases and forwards them to the real destination addresses. When the final mail server returns an error the bounce message returned to the sender reveals the final destination email address.…
EMP
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Postfix reject emails due to reverse DNS lookup failure when manual lookup works fine

I have bumped into the following in my mail.log file: May 20 21:50:46 degas postfix/smtpd[1596]: NOQUEUE: reject: RCPT from unknown[109.170.250.177]: 450 4.7.1 Client host rejected: cannot find your hostname, [109.170.250.177]; from=<***> to=<***>…
mfx
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Sending more than 24576 messages per minute using Postal

I'm using Russell Coker's postal software to stress-test our mail server. But I can't squeeze more than 24576 messages per minute out of it! This seems to be a limitation on postal's side as I can fire up another instance on another machine (or the…
MikeyB
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Preventing Sendmail Brute Force Attack on Solaris 10

I want to dynamically block specific connections that use the same IP address based on a rate or connection limit. Is this possible using Solaris/IPF or some sendmail extension? I want to limit sendmail login attempts to prevent brute force…
Andrew Case
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Setting up a test SMTP Server

I'm really a total newbie to this, so excuse the basicness (?) of the question. I have a default installation of Windows Server 2003, and I want to test an e-mailing application. What's the process for setting up an SMTP server on that box? Does…
andy
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Is there a service I can pay for that allows for 2-way email?

I have a dedicated server that I plan to use to host multiple web applications for a few different clients. If I have client1.com and client2.com, I would like web apps on those domains to be able to send email from their respective static IP…
Christopher
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Postfix: Using google apps for smtp errors

I am using postfix and need to send the mail using google apps smtp. I am getting errors after I thought I had set everything up correctly: May 11 09:50:57 zedsaid postfix/error[22214]: 00E009693FB: to=, relay=none,…
Zed Said
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Why does postfix mail server throw error 502 when testing email from Drobo Dashboard?

I'm configuring a Drobo on a Mac OS X 10.5 Leopard Server file server and am trying to configure email notifications. Unfortunately, when doing so, both our primary mail server and the local Mail service on the server throw a "502 5.5.2 Error:…
morgant
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SMTP Server Stops on Windows 2008 - Why? And Can I Auto Start It?

I have a Windows 2008 server and am running IIS 6 SMTP on it. Occasionally email will stop working and when I log into the server I see that the SMTP Virtual Server has stopped. What are some causes for this and is there a way I can auto correct…
Jason
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Exchange 2003 with SMTP dying every few seconds

I've Exchange 2003 which now all of the sudden have SMTP service dying every few seconds after restart of service. It started yesterday but after couple of hours i was able to stop this madness (to be honest not sure how) but multiple restarts,…
MadBoy
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smtp authentication on postfix mail server with slackware linux 13.1

I am failing to authenticate to the mysql mail database using saslauthd (cyrus-sasl2.1.23) thru pam-mysql. Below are some of the commands execute as well as the configurations root@xxxx:/# ps aux | grep saslauthd root 3443 0.0 0.0 34524 …
user80476
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How to define mail from and host settings in Websphere 6.1 for Java application

Working with some older WAS 6.1 hosts (fix pack 25), and have a java app that sends mail from one host with a mail from field: nobody@nosuchhost.nosuchdomain.com [mailto:nobody@nosuchhost.nosuchdomain.com] In another environment, it's sending mail…
RussMcGrindle
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Exim managing bounced and failed messages

What is the best way to handle bounces and immediate failures with Exim? An email sent to a large mailing list will generate a large number of immediate failures as well as bounces. I'd like to capture these bounces and immediate failures and…
Richard Keller
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