Server Fault Stack Exchange
Server Fault Stack Exchange

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

3133 questions
1
vote
1 answer

In exim's queue, how can I see when each message will be retried?

I don't want to force a retry just yet, I want to see when I should check the queue again. (Without having to mentally evaluate the retry configuration.) mailq only shows how long each message has been waiting, not how long until the retry time is…
ShadSterling
  • 143
  • 9
1
vote
2 answers

Mixing personal (SMTP/POP) and business (Exchange) mail in Outlook

Although I haven't done it, I'm pretty sure that you can set up Outlook (2010) to work with both SMTP/POP email and with Exchange simultaneously. Here is the scenario: I work with a group of independent contractors and we want to have joint email,…
Joel Brown
  • 215
  • 1
  • 5
  • 9
1
vote
2 answers

Plesk RHEL - email not received when originating from IP other than my server

My server runs PHP 5.3.8 and has this issue of not receiving emails that are sent from accounts located not in my server. For example, if I submit a message through a contact form on my blog 'blog123.com' to an email like 'astroman@blog123.com' the…
pepe
  • 153
  • 1
  • 6
1
vote
1 answer

What logs exist on an Exchange Hub Server that should be moved off the C:\ drive?

I'm trying to move any logs, queues, etc off the default C:\ drive, but am having trouble locating all the various settings. This gets tougher when you consider diagnostic logging, and everything else. Is there a comprehensive list of settings…
makerofthings7
  • 8,911
  • 34
  • 121
  • 197
1
vote
2 answers

Can I trust this SMTP Server Log?

We are investigating an issue whereby on occasion our email system and our customer's email system occasionally do not receive a copy of a third party invoice. We are using Google Apps and don't have access to inbound SMTP logs but the email is…
Michael Glenn
  • 651
  • 9
  • 13
1
vote
2 answers

Why Is There A Delay In The SendMail SMTP Banner Greeting When Primary DNS Server Is Unavailable?

CentOS 5.x / SendMail Hi All, Normally when I connect to my SendMail server, I see the SMTP banner greeting almost instantly. I've noticed though, that when the primary DNS server is unavailable for the SendMail server to access, the SMTP banner…
Mike B
  • 11,871
  • 42
  • 107
  • 168
1
vote
1 answer

Why can't I exit an SMTP dialog by entering a dot?

I've just started to set up an SMTP server on one of my test boxes. Postfix is installed and running, however, when I try to end a message it just does not work. All the documentation I've seen says that when you insert a "." (period) on a new line…
Hinchy
  • 143
  • 3
1
vote
1 answer

Tracking what email addresses my SMTP server has sent to

Do SMTP servers track the email addresses they've sent to? If so, how do I get the list? I've got a Facebook app that sends confirmation emails whenever a user successfully registers and adds that user to the database. The table got accidentally…
jsalita
  • 13
  • 3
1
vote
1 answer

Postfix won't accept SASL logins

I've followed this guide to setup an email server with IMAP and SMTP. IMAP is working great, but SMTP doesn't work. If I try to send a message using telnet: MAIL FROM: 250 2.1.0 Ok RCPT TO: 554 5.7.1…
Tom Marthenal
  • 2,116
  • 7
  • 25
  • 37
1
vote
2 answers

What does Diagnostic-Code: SMTP; 573 mean?

I am using sendmail to send mail from my Rails application. But, there seems to be a error happening while sending mails to a specific user domain. The error from /var/mail/*** is as follows: Date: Tue, 11 Oct 2011 16:33:46 GMT From: Mail Delivery…
rubyprince
  • 113
  • 1
  • 5
1
vote
2 answers

Sendmail relay authentication

I'm trying to set up my sendmail to authenticate against a relay (comcast). I'm not seeing any attempts to authenticate at all. I'm trying to just debug how authentication works, and can't connect all the pieces... I have, in my .mc…
Pawel Veselov
  • 766
  • 8
  • 19
1
vote
0 answers

Exchange 2007 and 2010 Journal Messages Stuck In Queue

I have a simple setup of 2 e-mail servers. My Exchange 2010 server, MS2010, is setup to forward all e-mails that it receives to the journaling mailbox. The journal mailbox is located on my Exchange 2007 server, MS2007. I have 2 messages in the…
pk.
  • 6,451
  • 2
  • 42
  • 63
1
vote
3 answers

What's a common mechanism for emailing in the background?

When users sign up to my site, the connection from my server to our 3rd-party SMTP provider is very bad and the app takes from a few seconds to a few minutes to connect. While it is trying to connect and send, users are forced to wait there and…
lamp_scaler
  • 577
  • 1
  • 6
  • 18
1
vote
3 answers

smtp return address rewriting

I work for a small company that has a simple customer service system. We have a single email address, support@mycompany.com, and a program that forwards that mail on depending on the inbound address. For instance, If we have two employees, Adam and…
Oliver
  • 125
  • 6
1
vote
3 answers

How to use SMTP to send mail to some host?

I'm trying to use SMTP to send mail to my account on some server (say, on Gmail). So far I've tried: 220 mx.google.com ESMTP y14sm3079810ibf.45 HELO 250 mx.google.com at your service STARTTLS 220 2.0.0 Ready to start TLS AUTH LOGIN Connection closed…
user541686
  • 437
  • 1
  • 6
  • 14
1 2 3
…
99 100