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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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PTR record and dyndns

I have domain name at dyndns.com and set at home smtp server. I try send mail to other servers but get error: 550 We cannot accept email from IP 92.46.76.192 without a DNS PTR record. Contact your ISP/HSP to set up PTR record for your server. How…
shk
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unable to connect gmail and hotmail via telnet

Hey all i am try to connect to gmail and hotmail server via telnet. As: $: telnet smtp.gmail.com 25 Trying 74.125.127.109... Connected to gmail-smtp-msa.l.google.com. Escape character is '^]'. 220 mx.google.com ESMTP j3sm3044317ybe.11 helo 250…
codeomnitrix
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dovecot/postfix: can send & receive via webmin, however squirrel mail and outlook fail to connect

I have just finished setting up dovecot and postfix on my server (centos 5.5/apache) earlier today. So far I've been able to get email working through webmin (can send/receive to and from external domains). However, attempting to telnet…
Jonathan
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Sending e-mails with SMTP from PHP on Ubuntu Server

I having problems sending e-mails from my PHP application coded with CodeIgniter framework. I've a fresh install of Ubuntu Server on a VMWare with Apache, PHP and MySQL. The error I get is the next: 220 linux11.dns-servicios.com ESMTP hello:…
udexter
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Lean & mean, basic SMTP server, for use over a single domain, no fwd'ing

Looking for recommendation for a light-weight, SMTP server, with basic capabilities (will be run on port#25, with authentication but clear-channel), and it's use shall be limited to a particular (or a small set of) domain(s), i.e. mail to/from same…
icarus74
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receiving two emails to virtual alias

have a virtual alias setup in /etc/postfix/virtual that reads: @mydomain.com mydomainincoming I then have a pipe setup in /etc/aliases that reads: mydomainincoming: "|/var/path_to_script/myscript.php" whenever I send mail to more than one user such…
Richard Castle
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How can I configure Windows Server 2008/IIS 7 to send email via an asp.net web application?

I recently moved a long-functioning web app from a Windows 2003 server to a windows 2008 server. Everything works fine, save for the email service (send password and the like). The code works on my local machine and the original web server. The…
Steve French
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Postfix relaying : email to multiple addresses with one relay

I have postfix installed on an ubuntu server so my website can hand it email to relay onto sendgrid.net. Before I installed postfix I setup swiftmailer to send the email directly to sendgrid.net, and when there were multiple email addresses, it was…
Mike Bates
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How to setup a reliable SMTP server on Windows Server 2008 R2

I know there are SMTP services out there which you can pay to send e-mails with but surely it's not that difficult to set up one of your own. How can I set up an SMTP server on Windows Server 2008 R2 that is: - Secure; only authorized…
georgiosd
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sendmail: SMTP host name lookup failure

I haven't made any changes to sendmail and now it's failing to send any email out due to this error (I use my ISPs SMTP server): Jan 28 10:34:36 zenorebirth sm-mta[3225]: p0S9htol031342: to=test@gmail.com, delay=05:50:00, xdelay=00:00:00, …
Zeno
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How to set PTR record on Windows Server 2008?

I'm having some problems sending out emails from my SMTP Server... apparently I need to setup the PTR record for Reverse-DNS Lookups. I have no clue how to do this. Some instructions point ask to go to Administrative Tools click on DNS there is…
RadiantHex
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means to verify whether mails sent using a java application is delivered to the destination by the SMTP mail server

I am trying to send mails in large numbers, say 1000, using a java test application and a mail server, but though the application confirms that it has sent all the 1000 mails without any exceptions, I am not receiving the exact number (1000) of the…
user68145
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Suggestions on changing an internet smtp server's ip address

We are moving one of our smtp servers from one hosting provider (A) to another hosting provider (B). Because of this move, the IP address of the server will have to change. Our plan is to do the following: Build clone system at new…
MrSunday
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Checking an Windows 2003 SMTP server from the command line?

I have a simple SMTP server installed on an IIS instance on a Win2k3 server. I want to figure out why my messages have stopped being relayed, but apparently I have to install Exchange System Manager to do this? I
user67763
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Send Mail From Another Server

I have a server that has been sending email for the past 2 years, using PHP's mail() function. It runs Windows Server 2003. I have another server, on the same local network as it, running Ubuntu 10.10. Is there a way I could tell a PHP script…
Josh
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