Simple Mail Transfer Protocol is the protocol used for sending email.

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Sending email using Telnet

I saw many thread about sending email using Telnet, but I couldn't do that. I'm trying to connect to yahoo smtp server by : telnet smtp.mail.yahoo.com 25 The response from server is : Trying ...
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176 views

Lexmark Printer Requires Local Copy of Gmail's SSL Certificate

Recently I had to fix a problem in a clients office where their "Scan to Email" function wasn't working on their Lexmark printer. A gmail account's SMTP settings had been working with SSL for several ...
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110 views

What is the proper way to set SMTP headers for emails sent as someone else?

Some applications require that system-generated emails be sent as someone else, or said more accurately, they call for the appearance of being sent from someone else. What is the proper/acceptable ...
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86 views

Can I set-up sendmail on a LAN without a registered domain for testing mail?

I am running CentOS on a server at home which I use for development of Joomla websites. After they are developed, I move them to a hosting service. While developing the Joomla website on my home Linux ...
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1answer
160 views

How to prevent accidental emails sending to clients as CC? (Instead of BCC)

I'm trying to figure out how to prevent accidental leak of clients emails addresses when employee pastes them to CC instead of BCC. Is it a way to restrict sending cc mails to addresses from ...
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465 views

Postfix allows unauthenticated users to send emails

Hey I set up Postfix to use cyrus SASL implantation and I'm able to login and send emails, but I can still telnet on port 25 and send mails even if I'm not authenticated, which I whish to deny. ...
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29 views

SMTP Headers Guide [closed]

Is there a guide/cheat sheet that explains Email/SMTP headers in detail? I could not find any useful resources after plenty of Googling. The purpose is to understand the headers in order to be able ...
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1answer
20 views

Postfix with two vhosts

I've got this problem: I installed postfix (v. 2.10.2) on Ubuntu 13.04. I've got there two vhosts with two different sites, for example: aaa.com and bbb.com. Got those domains connected with google ...
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2answers
506 views

550 User Unknown cmd telnet error (Email spoofing)

I'm trying to send email using telnet in cmd. I have connection with telnet now. Btw I'm using a disposable email provider. C:\Users\Student>telnet mail.dispostable.com 25 then it brought me ...
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448 views

telnet 500 Syntax error, command unrecognized

I'm trying to send email using telnet in cmd. I have connection with telnet now C:\Users\Student>telnet alt3.gmail-smtp-in.l.google.com 25 then it brought me here: 220 mx.google.com ESMTP ...
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3k views

Email without SSL

I have been trying to setup LabTech Email settings. Unfortunately, it accepts only email settings that are not encrypted; no SSL/TLS i.e POP 110 and SMTP 25. Tried to setup SMTPSSL in the same, but no ...
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131 views

How to send Outlook mail when port 25 blocked in intranet

We have a build server which runs daily builds. We want to send email to project leaders after each build with details (success, fail, etc). The problem we have is that we don't have access to port ...
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1answer
371 views

Postfix is Sending Spam [closed]

I have an Ubuntu 12.04 server, hosted on AWS, that powers a dozen WordPress installations using Nginx and php5-fpm. The problem just began one day. My server was down. Panic! Whenever I turned it on ...
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1answer
762 views

How to find out the outgoing server and port from outlook?

I have Windows 7 and running outlook 2007 (wtih exchange mailserver). I want to switch to Thunderbird. Have spent some time to search both on SU and google without really finding a succinct answer to ...
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2answers
124 views

How can I hide IIS SMTP version number?

If I type the following command and connect to my production server (Windows 2008): telnet myserver 25 I see the following result: 220 myserver Microsoft ESMTP Mail Service, Version: 7.0.xxx ...
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1answer
117 views

Japanese cannot connect to european SMTP server

My SMTP server is located in central Europe and I can connect to it just fine. However, a user from Japan was not able to connect to my server using Thunderbird. I set it up together with him and ...
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1answer
32 views

Disabling sentbox in postfix over Squirrelmail

I have installed POSTFIX over Squirrelmail on CentOS Linux... The services I have ran are: service httpd service ssl service mysql service postfix service saslauthd service dovecot But I want to ...
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46 views

SMTP listeners on a workstation?

I'm working on a Debian 7.30 (x64) workstation. I noticed I have a couple of SMTP listeners: $ netstat -A inet,inet6 --listening | grep -i smtp tcp 0 0 localhost:smtp *:* ...
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204 views

Unknown attack to SMTP server

From yesterday I have a problem with sending messages via my SMTP server (MS Windows Server 2012 R2, software: MailEnable 8.02 Professional). I found that there are constantly sending some emails via ...
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1answer
480 views

Postfix: relay mail to smart host for specifc users

Currently i have a VPS that has a host of email accounts on for several domains. most are simple and have all local mailboxes. but i have one user that wants to have a hosted exchange account but ...
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39 views

How to use emailrelay?

I'm trying to use "Emailrelay" to make Windows Server 2008 send emails. Googleing sugests that this would be the easiest option to send automated emails from the "Task Scheduler", but I can't seem to ...
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52 views

How to determine if STARTTLS IMAP & SMTP connections are encrypted

I use Thunderbird to connect to an IMAP and SMTP server. This works on the port numbers usually associated with unencrypted mail, but I have specified STARTTLS and am told that the servers enable ...
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21 views

SMTP routing cases: same @domain as sender and different @domain

I would like to know what is the difference between sending an email to the same @domain as the sender and sending to a different domain. I cant really find a detailed explanation on the web. From ...
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40 views

Exchange 2007 import SMTP addresses to distribution group

Is there any way of importing SMTP addresses for a distribution group in exchange 2007? I have a list of email addresses (eg a@domain, b@domain...) in a csv which I want to add to the distribution ...
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291 views

Roundcube SMTP Error (-1): Connection to server failed

I am trying to send an email via RoundCube. Recently I manually installed it to a subdomain instead of accessing it via cPanel thus it's way easier on clients. I always get this error when I try to ...
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120 views

SMTP blocking a legit email, no way to contact yahoo or anyone about it?

Very frequently, I have trouble emailing from Yahoo to people with their own domain. For example, when I send an email from myname@yahoo.com to someoneelse@theirowndomain.com, I'm getting a bounce ...
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2answers
48 views

Mailserver standard filenames? [closed]

I have 3 mailboxes (gmail, 2 from univeristy) and 3 mailclients (apple mail, k9, thunderbird, evolution at work). Getting the clients to work together is a pain in the .... What are the names for ...
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336 views

Postfix for use with Django

I have a default Ubuntu 13.04 install on which I'm running a simple web game using Django. I need to be able to send email from that and the forums I'm using, I don't need to receive any mail or ...
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2answers
4k views

Monitor Postfix outgoing mail delivery

I'm using GNU Mailman with Postfix to run a mailing list, and would like to monitor the delivery of outgoing mail, that is: for each mail sent from the list, check whether a 250 (OK) message was ...
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3answers
299 views

“SMTP protocol error” when sending mail in emacs

I'm trying to configure emacs to send mail through an SMTP server, but so far, I've not been successful. Here's the output I'm getting: 220 __SMTP.SERVER__ ESMTP Sendmail ...
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1answer
356 views

How do I send email from my domain? [closed]

I am running Discourse and sending verification email, but the emails have my gmail address as sender and they go to spam folder and Google throws a warning that this may be phishing. Do I need to ...
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89 views

mutt with imap occasionally fails to send an email - where does it go (where is the “background” limbo), and what can I do to fix this?

I have started using mutt with IMAP. The SMTP server is a university server and I use zile as my texteditor when composing emails. set smtp_url=smtp://djcm1@smtp.hermes.cam.ac.uk:587/ Roughly one ...
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51 views

Connection via tracepath but not via telnet

EDIT: I have problems sending emails with Thunderbird. IMAP connection works without problems, but SMTP is not connecting. I have tried different settings: No connection security (port 25), ...
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1answer
233 views

Rapidly changing public IP address causes issues with site login and server connection

Since I changed my ISP, I have had issues logging into sites (e.g. StackExchange), MMORPGs and connecting to SMTP servers. I did some research and it turns out that my public IP address is changing ...
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1answer
1k views

Postfix: SMTP, use port 587 rather than 465

I have set up a mail server on AWS EC2 using the instructions from Flurdy: http://flurdy.com/docs/postfix/ it has mostly gone well. My issue is that I would prefer to use SMTP port 587 with TLS ...
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1answer
124 views

Is it possible to use an outgoing SMTP server from Laos?

While traveling in Lao PDR, I've subscribed to an unlimited cellular data plan (at Lao Telecom) because I have to maintain some websites during my trip. Everything works fine (connection is even ...
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1answer
182 views

Setting up Ubuntu server to send mail

Can anybody point me in the right direction on how to set up my webserver so that the sites can send mail via phpmailer? I have installed postfix using sudo apt-get Then during the installation I ...
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55 views

How to check email generated by WHMCS billing system before they are actually sent

The WHMCS billing system that I use sometimes generates wrong invoices (due to bug or me using it wrongly due to the complexity of the system) and this is being sent out via SMTP (for my case gmail) ...
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1answer
119 views

Disabling smtp authentication for local mail on same domain

I am very new to smtp and am looking for something to deal with the current situation: I have several servers running really old software (music automation) and they all need to report in daily via ...
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1answer
126 views

How to use a different SMTP mail relay for sending emails with a message size over 10MB

I use Amazon SES as a mail relay service for my emails as my server host blocks connections out on port 25. SES works great, however occasionally users send large attachments (>10MB). Whilst I could ...
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1answer
52 views

ip set for smtp mail failed

I config smtp server with postfix , and Debian 6. I set 1 ip from 4 Ips of server for smtp server mail.mydomain.com xxx.yyy.zzz.hhh but when I send mail with smtp server , Destination server ...
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3k views

Postfix smtp send error - what's wrong here?

I am currently setting up a new virtual private server with Debian Wheezy. I managed to install postfix, dovecot (IMAP) and MySQL. Up to now, I can successfully login via SSL with an external mail ...
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60 views

SMTP Client implementation [closed]

I'm implementing SMTP client. What should the client do once it already sent the "." at the end of the mail, but didn't receive "250 Ok"? This is how the conversation between the client and server ...
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3answers
186 views

Every minute incoming, rejected connections to SMTP

I have a feeling my server is being lazily DDoS'ed, though, I have never experienced it before, so, I may be wrong. Every minute, my journal logs the following 3 entries: Nov 05 21:10:47 ...
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2answers
188 views

ipa.gov.newyork@usa.com is sending mail using our Synology mail server

This is scary and I don't know where it came from. I got a problem sending emails got an error SMTP error 452. As I searched the meaning of this I got "Too many recipients received this hour.." So ...
2
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1answer
7k views

NOQUEUE: reject: Relay access denied

I recently setup a mail server following the instructions on linode.com (https://library.linode.com/email/postfix/postfix2.9.6-dovecot2.0.19-mysql) except I am using postgreSQL instead of mySQL. ...
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1k views

DDoS attack on SMTP

I am not sure whether this is the right place to ask this. But now I am in a great difficult situation. Our server is undergoing SMTP DDoS attack. The mail service has been totally down. We have ...
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1answer
742 views

Mail server configuration on Ubuntu 12.04

This is kind of a basic question and it might sound stupid but I am new to this whole mail server thing and I am trying to learn how to setup one. I have a VPS server which runs Ubuntu 12.04 ...
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1answer
2k views

Testing SMTP via Telnet, “help” returns “500 unrecognized command”

When using PuTTY in Windows (I specify a mail server, Telnet protocol, and port 25), the "help" command returns "500 unrecognized command". This is strange since I expected to get some actual help. ...
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211 views

Is the SMTP of the ISP safe?

I am just curious, because I am using the SMTP of our ISP in my mailserver. Do you think it is safe to use, meaning can my ISP snoop in my emails? What do you think?