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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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Nginx configuration as a POP3/SMTP reverse proxy on DMZ

Possible Duplicate: nginx as smtp proxy i am here to ask help about how to configure Nginx as a reverse proxy for POP3/SMTP service. We have a Zimbra server offering services as webmail, POP/SMTP, Calendar, etc. The Zimbra server inside the LAN…
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Postfix mail gateway/relay for limited domains

I have a number of servers at a hosting space. What is the best way or is it possible to run a relay on one of the system to send all emails to alerts@myowndomain.com to our email hosting service ? (we have our own DNS for myowndomain.com…
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IIS 6 Smart Host Outbound Security

I'm using the IIS 6 smart host setting to forward all email sent through IIS to SendGrid. It works fine if I set the Outbound Security and smart host settings at the top level of the Default SMTP Virtual Server properties. But the downside with that…
thelsdj
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Postfix MySql Dovecot - SMTP Authentication Failure

Hello I have a Postfix setup with Dovecot and MySql. The server is running Debian Squeeze. The MySql server is a slave that has data pushed to it from a primary (postfix) mail server(running a different os). The emails are stored on a replicated…
borncamp
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Send email from different domains to different external IP's on a single server

I have set up a windows 2008 R2 server to route email from Exchange 2010 using SMTP Server in IIS. I have 3 seperate domains and would like to route each one through a different internal and external IP for (IP Reputation etc), at the minute it is…
user140429
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Emails sent from Coldfusion using the same SMTP/Exchange server works from one machine but fails for another

First, apologies if this question is too vague or has too little information to really be answerable. I am not normally working with these issues, and I don't have full access to the environment. However, the hosting provider seems to have a hard…
Peter Herdenborg
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SMTP Relay via MS Exchange

I am trying to pragmatically send e-mail to external user with Exchange. Now I know if Relay is not Enabled in Exchange Server then e-mail relay will not work. Now, if I send e-mail from my Outlook I can send e-mails to, say, hotmail. But when I am…
Amirul Islam
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Is there a common X-Header for RFC 2821 "MAIL FROM"? Should it be DKIM signed?

w.r.t. the difference between RFC2821 MAIL From and RFC2822 FROM I'm considering having my MTA add a header specifying what was sent in the MAIL FROM portion of the envelope. The RFC2821 header is used for receiving email bouncebacks, and is the…
makerofthings7
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PHP Mail Relay via Remote smtp Server

Possible Duplicate: How to configure php.ini with remote SMTP? We have a php application running on Linux which sends emails to there users. Currently its setup like php.ini is configured to send via local sendmail server but we have separate…
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How to get php mail function to work on Debian “squeeze”?

Possible Duplicate: Getting PHP mail() function to work on Debian Lenny I have installed Apache and PHP5 on my debian server. Firstly I tried it using sendmail. Here is the step by step procedure that I have tried : Step 1: apt-get install…
Neel Kamal
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Thunderbird 15.0.1 cannot use Exchange 2003 SMTP

I'm having the strangest time getting a Thunderbird email client to connect to my Exchange 2003 server. I got the incoming IMAP account set up no problem, and I can receive mail. However sending mail will not work no matter what SMTP settings I…
speedreeder
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Create a mailbox in qmail, then forward all incoming message to Gmail

I needed to let PHP send mails from my webserver to my web app users. So I installed qmail on my Debian server: sudo apt-get install qmail I also updated files in /etc/qmail specifing my domain name, and then I run sudo qmailctl reload and sudo…
lorenzo-s
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Mail to SMTP Server via Exchange

The title already says much; I want to send mails with an adress ( test@something.com ) Until we got our Exchange-Server, we were recieving via POP and sending via SMTP. The office (4 People) wants still to recieve and send with this E-Mail. The…
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Sending emails with Thunderbird + Postfix + Zarafa does not work

I installed zarafa on my vserver and use as MTA postfix. The webaccess works fine, I can revceive and send emails, also receiving mails with thunderbird (IMAP ssl/tls) works. But there is a problem, sending emails with thunderbird. I established an…
Sven Jung
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DKIM sign any outgoing mail as the same domain. is possibly?

I have a website, and the users recommend via email to another persons, so the mail come from my site, but I need to appear the user as sender, but "via" mydomain. The logically and what lists management software and companies do is differ the "MAIL…
Felipe Alcacibar
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