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.

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Google IP Address Ranges for incoming SMTP

Essentially I'm answering my own question here, but want to provide this info to anyone else who might need it. I need all the valid IP address ranges for Google Apps mail servers. I'm configuring a ...
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1answer
59 views

Have Postfix bounce certain addresses with a custom message and forward all other messages to another server

We have a list of users who no longer have mailboxes in our Exchange environment. We want to have a very specific reply to these users with a possible custom variable. I thought Postfix would ...
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2answers
76 views

Reverse DNS (PTR) for Email

We are hosting our website (http://www.redappleapartments.com) with a hosting company in Sweden. And we are using godaddy as our email provider. So, our smtp servers are smtp.europe.secureserver.net ...
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1answer
60 views

Postfix multiple checks

I want to achieve the following with Postfix: Run all emails through a black list Allow any clients sending to a list of domains Allow some clients sending to any domain This is what I have: ...
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46 views

Two servers, severals domains, reverse DNS and blacklist

I will try to explain the context. 2 VPS with PLESK 11.5 The first (named vps67877.ovh.net - we call it v67) is a mail server (ip 37.187.33.38) The second (named vps68789.ovh.net - we call it v68) ...
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56 views

Collectd notify_email Plugin Not Working On Ubuntu 14.04

I'm attempting to set up e-mail notifications using collectd and the threshold / notify_email plugins. I'm running Ubuntu 14.04 LTS, attempting to relay e-mails through Amazon SES. Relevant package ...
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1answer
92 views

5.7.1 SMTP error when running stored proc using DB Mail in SQL Server 2012

I am getting an error in SQL Server 2012 Database Mail when executing a stored proc to send an email from a specified address to a specified address using Office 365 as the SMTP server. The mail ...
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30 views

hMail server - sending copy of an e-mail changing the sender

Dear All please help me with following request. I am using hMail server in a company(test.com) and have several hundred of guest e-mail accounts (guestxxxx@test.com). I need to accomplish this: ...
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47 views

sSMTP Configuration issue for Zoho mail

I was using following configuration to send from Gmail from sSMTP from Ubuntu using PHP # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to ...
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21 views

How to find the smtp connection of an organisational mail?

I am using alfresco 4.2e which uses smtp configuration to send mail. Here is my required configuration mail.host=smtp.gmail.com mail.port=465 mail.protocol=smtps mail.username=abc@gmail.com ...
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1answer
33 views

Exchange 2007 issue internet receive connector

I have issue with yahoo.co.uk if I send a mail from within the yahoo webconsole the mail arrives in my inbox on the exchange server If I send mail from Iphone configure to send via mail box ...
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1answer
38 views

Maximum length of MAIL FROM address

When sending out emails with a MAIL FROM address > 81 characters I receive bounce messages from some MTAs: 501 Syntax error - Badly formatted address. (in reply to MAIL FROM command) As soon as ...
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1answer
42 views

Sendmail.mc: alias all incoming e-mails to one account

I need to alias all mail coming from another SMTP server to this one account "myinbox". The system in question is to receive all e-mail on the domain, if that's any help. ...
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1answer
48 views

SMTP Server setting on Windows 2008 R2

I am very very new to this and just trying to configure SMTP virtual server. I have followed a few threads to get it all running, but the mails are not being delivered. What I have done so far - 1) ...
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117 views

Email client wont connect to SMTP Authentication server

Im having trouble installing SMTH Auth for my ubuntu email server. I have followed ubuntu own guide for SMTH AUT (https://help.ubuntu.com/14.04/serverguide/postfix.html). But my email client ...
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1answer
71 views

Windows 2008 RC2 IIS6 SMTP Virtual Servers - Limited to 4

In line with this post: http://www.hugheserblog.com/2012/05/22/error-creating-iis-smtp-virtual-servers/ I am receiving the same issues: When we tried to add more than 4 IIS SMTP virtual servers, ...
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69 views

How Do I Configure Nginx To Communicate with SMTP Server?

I'm an application developer and have little knowledge on sysadmin / server configuration tasks. I have an nginx server communicating to a Flask web application through uWSGI on a VPS. I'm trying to ...
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27 views

How can I limit the amount of messages SendMail will recieve in a single incoming connection?

Is there a way to limit how many messages can be received by SendMail in a given SMTP session? I have a SendMail server and an upstream application server is trying to send dozens (potentially ...
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2answers
106 views

What does the SMTP status 250 BONHAM COOLED BY FIRE mean?

I noticed this in my email server logs recently: status=sent (250 OK BONHAM COOLED BY FIRE ...) I searched, and the only reference I could find anywhere else on the internet was in this ...
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1answer
44 views

Exchange 2010: Send emails via STMP with custom From address to outside the domain

The requirement(s): (1) Connect to Exchange via STMP and (2) basic authentication and send emails with a (3) custom From address to (4) recipients outside the domain. I was able to get (1) - (3) ...
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71 views

Posftfix - MTA during fwd-connect Negative greeting

I have problem with postfix on Debian Squeezy (Yes. Squeezy). I can't send email, idk why. My postqueue: root@mx-2:~# postqueue -p -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient------- ...
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1answer
39 views

Does SMTP accept “friendly” address in FROM line (in particular Exchange)

I have an application server sending mails with SMTP, and this application generates a FROM line that contains a "friendly address" that seems to be refused by Exchange, of the form: MAIL FROM: ...
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1answer
107 views

Exchange 2010 SP3: 4.3.1 Insufficient system resources

We have Office 365 with a hybrid deployment. Our on-premise server is relaying email directly out to the web (not via EOP). domain-a.com is an accepted domain on our on-premise server; domain-b.com is ...
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1answer
192 views

DNS Zone Record: How to set up MX Record correctly? [closed]

I've been search for this for quite a while, and tried many different examples for weeks (because I usually have to wait a couple hours for the DNS change). Nothing made my mail() in PHP as well as my ...
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1answer
480 views

How to configure synology NAS for SMTP server [closed]

first of all I have to admit that I'm a beginner in this topic. In fact this is my first post. I have a synology 213J that I want to configure as SMTP server. I discovered that I needed a domain in ...
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2answers
127 views

Postfix not sending mail :

I have postfix installed on my webserver and, since a couple of days, it seems that it cannot send mail anymore. All my messages are in postfix queue and I have each time the following message ...
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1answer
46 views

Service Closing transmission on OpenSSL [duplicate]

I am trying to send email through OpenSSL as below : Client > openssl s_client -crlf -connect smtp.mail.yahoo.com:465 SERVER > 220 smtp.mail.yahoo.com ESMTP ready Client > HELO localhost ...
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1answer
107 views

“Postfix SMTP server: errors from *” repeated automatic response

I'm attempting to setup a mail server with Postfix and Dovecot. It's not really working all that well, but there's something more urgent I'd like to get fixed first. I sent a few test e-mail ...
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2answers
50 views

How can I allow specific addresses to send email?

I have a network split into two parts - one for office and server computers, and one for computers that manage scientific instruments. The instrument computers are running on the vendor's patch ...
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1answer
65 views

SMTP Server will not send to connected VPN domain

I have a Windows 2012 web server that is connected to a company's VPN (vpn.company.com) to access network resources and needs to send emails to users of that company as well. When the web server is ...
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2answers
183 views

Setting up SPF records on dedicated server

I have a question in regards to SPF records in a dedicated hosting environment. I wish to set up an SPF record for my dedicated server, but I am not sure whether my understanding is correct. First ...
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2answers
261 views

Why is my email being rejected?

I am having problems sending an email from one email address to another on my domain. I am using a shared server. I use weather software which automatically constructs and sends the email message. I ...
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92 views

Virtual SMTP to send email through Exchange Server (via EWS)

We have a web application hosted by a third party that must send e-mail using an existing MS Exchange Server 2007 account in our premises. This application only connects to SMTP Servers. Our ...
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1answer
80 views

Overriding selected recipients using postfix

Is it possible to have some kind of regex match and replace, like it is possible for outgoing mails for incoming, too? I am already able to replace the from field for outgoings, by using the ...
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1answer
28 views

What is the maximum message size that SendMail can successfully receive and where would the bottlenecks be?

CentOS 5.x | SendMail 8.14 I'm curious - what is the largest message size that SendMail will successfully accept from an upstream source via SMTP? The tweaking config options page indicates that by ...
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1answer
503 views

Postfix/smtpd: Client host rejected: cannot find your hostname

I'm trying to set-up a mail server, using postfix and dovecot. Everything works fine, and I can connect in IMAP using Mozilla Thunderbird. But when I'm trying to send emails using the smtp server, I ...
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1answer
38 views

IPtables mail is not working though i allow smtp traffic

I'm working server Centos 6.5. I allowed incoming and outgoing traffic for SMTP as below though i'm unable to sent mail from server if iptables are switch on. My IPtables files rules are as below ...
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1answer
82 views

cPanel Change SMTP send port [closed]

Our ISP blocks outbound port 25 (annoying) and we are currently paying for a relay service. One of our clients on the server is running a high traffic website and pretty much everyone who goes on the ...
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4answers
139 views

How can I secure postfix so my ISP won't block it?

Our dev server is a CentOS LAMP system for developing web sites. We want PHP to send email. The server doesn't need to receive email or anything else, literally just send email to our developers. I ...
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1answer
69 views

Fail to relay email with Postfix

I want to relay mail to local SMTP to mandrillapp, with the /etc/postfix/main.cf smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no smtp_sasl_auth_enable = yes ...
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120 views

Diagnose SASL LOGIN authentication failure with postfix and sasldb

I am trying to configure a Postfix SMTP server on my personal machine (ubuntu server) using sasldb2. So far what I have set up works well with the test command: testsaslauthd (however it may be ...
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25 views

Postfix tries to deliver forever

I have a postfix mailserver on LAN which is only used to send email alerts to internal domain names. It does not have any route to the internet, nor does it have a DNS setup. Now after couple of ...
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2answers
59 views

Do I need SMTP when using Postfix/Dovecot? [closed]

I have setup Postfix and Dovecot. Microsoft outlook tells me it cannot find the SMTP server. I thought dovecot would handle all the deliveries? Do I need to allow postfix to listen to external ...
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51 views

migrating to new server, would like to keep sending email from existing server

Hello I'm in the process of moving my site to a new host (ie new IP). I run a social site that sends a large volume of (valid) email, and I have built up a good sending reputation with my current IP ...
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59 views

force upstream smtp outbound through proxy

Upon inspection of emails sent outbound to external domains, the backend is revealed as being the true sender, rather than the proxy itself. When sending within the domain, from local user to another, ...
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37 views

Should I block the other SMTP ports as well to block outgoing mail?

I have blocked outgoing port 25 to prevent spam being sent from my servers. However, I'm not very familiar with SMTP and I have heard that ports such as 465 and 587 can also be used to send mail, but ...
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35 views

Tripwire unable to send mail

I'm installing Tripwire Enterprise Console (Server) onto a windows server that happens to be an SMTP forwarder. I proceed through the steps to install TEC and it completes not reporting any errors. ...
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1answer
110 views

How can I disable sending mail through postfix smtp with out auth

I just setup a mail server with postfix 2.6.6 and dovecot. I have the auth related config in main.cf like below: smtpd_tls_cert_file=/etc/httpd/ssl/mail.crt ...
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1answer
177 views

Configure Citadel to be Used For sending email using smtp

Sorry for this foolish question, but I have less knowldge about servers. So bear with me! I have configured Citadel as directed in linode documentation and can login using the front-end for accessing ...
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1answer
90 views

Sending mail from PHP gives Unrouteable address

I have a Debian server running PHP and Exim4 (among other things of course). The PHP application is sending 1000s of emails every day all of which work fine, however I now have a new customer and my ...