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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2
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1answer
33 views

Exchange 2010 is trying to relay messages for delivery

I am using Exchange 2010 on premises. I am in the process of setting up a SMTP proxy that will receive all messages coming into the office, log them, then forward them to my exchange server for local ...
4
votes
2answers
10k views

Exchange Connector Won't Send to External Domains

I'm a developer trying to get my .Net application to send emails out through our Exchange server. I'm not an Exchange expert so I'll qualify that up front!! We've set up a receive Connector in ...
-1
votes
0answers
88 views

How to set gmail smtp on Postfix (Centos 6.6)

i am out of luck, have tried almost everything but it does not work. I have a static IP. Now the log error: **Must issue a STARTTLS command first...** Here is the main.cf config: # postfix ...
-2
votes
1answer
36 views

Overcome Gmail smtp send limit [closed]

I have a few IP cameras which sends photos to an email address if motion is detected. My problem is that someone times a lot of motion happening and the camera will flood the Gmail smtp server which ...
-1
votes
0answers
68 views

Exchange 2013 - Reverse DNS does not match SMTP Banner

mxtoolbox gives me some negative points i would like to ask about im behind Cisco, which doesnt currently support TLS/esmt stuff, will be upgrading OS later. Currently my HELO looks like: 220 ...
1
vote
1answer
26 views

Relay Mail from an application to Gmail through ssmtp

i want make my linux server to receive mail from an host (LAN but if possible through Internet) and than relay to Gmail. I made the second part with ssmtp let the server send mail through Gmail using ...
-2
votes
0answers
24 views

Setting up SMTP correctly [duplicate]

I've created a mailbox on my VPS, using CentOS and Virtualmin. But all mails that I send go to trash. I've used http://mxtoolbox.com/ and from what I understand it goes to the trashmail because of a ...
0
votes
3answers
803 views

HP Power Manager SMTP setup doesn't have space for username & password

Is there some way to configure HP Power Manager to not assume that there's an email server running locally? We recently acquired an HP T1500 G3 UPS, which we're trying to control using HP Power ...
1
vote
1answer
35 views

Which incoming port is required by JIRA's outgoing (SMTP) e-mail functionality?

I have a JIRA 6.3.15 installed on an Ubuntu 14.04 in a VirtualBox VM. The host system for VirtualBox also is an Ubuntu 14.04. I configured JIRA to use SSL (as described here ...
7
votes
1answer
3k views

Postfix TLS over SMTP - RCPT TO prompts renegotiation then 554 5.5.1 Error: no valid recipients

I've setup ispconfig3 on my debian six server, and here is a little smtp over ssl: The server is postfix AUTH PLAIN (LOL!) 235 2.7.0 Authentication successful MAIL FROM: lol@lol.com 250 2.1.0 Ok ...
0
votes
2answers
916 views

SMTP 550 5.1.1 error when sending email with postfix via amazon SES

I've been following this manual starting at page 26. First I've already made a tunnel with stunnel, and also I've already got conected via command line with amazon servers, then in my postfix main.cf ...
-1
votes
1answer
74 views

Configure email SMTP Server on Apache2 [closed]

For a while we decided to use another Server (VServer "B") for our Mailserver. I transfered all email accounts and mailbox from VServer "A" to VServer "B". VServer "B" runs well and the clients are ...
-1
votes
0answers
33 views

Postfix cannot receive email from external domain

I know this question has been asked umpteen times, but after lot of research, it did not solve my problem, so I thought of posting it. I've installed postfix on a server. I use ssh to log into the ...
8
votes
8answers
37k views

IIS/SMTP - emails are stuck in mailroot/Queue

I'm trying to send e-mails via SMTP within the IIS pickup directory. Unfortunately the e-mails are just going into the mailroot/queue folder and stay there. They never actually get sent. Does ...
1
vote
0answers
23 views

Outlook stalls when sending multiple emails

I have an issue very specific to outlook and a single email domain. I work for an email and website hosting company. When sending one email to a foreign domain, no issues. When sending more then ...
1
vote
2answers
60 views

Reliably send small amount of mail from possibly blacklisted cloud IPs

So you boot a new cloud server. Only to discover that its IP is blacklisted by misbehavior of the previous owner. How to make sure your mail gets delivered for a modest price? Context: I provide my ...
0
votes
2answers
39 views

Which Exchange 2013 Role will allow mail relay

We have a service that connects to our default receive connector in exchange, which relays the message to external users. Currently I have configured the service to use my DA account which assigned ...
1
vote
1answer
61 views

Postfix lookup failure: works from localhost, not on other nodes in LAN

I am getting temporary lookup failure for the recipient address when trying to send email using Postfix and Gmail from a machine other than the host, on the same network. It works just fine when ...
0
votes
2answers
48 views

How to set exim to use outside SMTP?

I want my scripts on the server to be able to send emails, but via outside, 3rd party mail service for which I'm paying anyway. I have exim and even dovecot installed anyway, but I suppose i will need ...
-4
votes
2answers
25 views

Can I use SRV to receive mail on port 2525 ? How must I configure it in my DNS? [duplicate]

Is it possible to use a SRV rule on my DNS to receive mail on port 2525 instead of port 25 ? If it is possible how can I setup this rule correctly ?
-1
votes
1answer
33 views

Sending emails from non-configured domains with postfix/dovecot

I am trying to setup a mail server with postfix/dovecot. I can currently receive emails and send emails from domains that I have configured. I have a lot of domains and my email setup is simple - ...
0
votes
1answer
356 views

smtp auth with postfix reject with error 'need fully-qualified hostname'

I have some kind of a problem with a mail server consist of postfix + dovecot + roundcube on a debian squeeze. Sending and receiving mail from roundcube workd perfectly. But I can't send mail from an ...
0
votes
2answers
33 views

Disable SMTP on Windows SBS 2011

I have a server running Windows Small Business Server 2011 Standard. I have disabled the SMTP service, removed the Web Server Role, and blocked port 25 in Windows Firewall. Why am I still able to ...
0
votes
1answer
46 views

Incorrect FQDN on Exim4 send-only SMTP mail server

I am pretty new to Linux systems and I am trying to send e-mail to my gmail ID using exim4. I found many tutorials for exim4 online and I am doing exactly that, however I never receive any email. The ...
-1
votes
0answers
57 views

Transaction Emails Magento 1.9.0.1 AWS and Amazon SES

I am working on a magento store which is installed on AWS EC2. I have setup Amazon SES to handle email and I installed the extension aschroder SMTP which supports Amazon SES. Using this system I am ...
-1
votes
0answers
40 views

Postfix SMTP mail is sent to SPAM

I have installed postfix mail server in ubuntu machine. I configured the mail server as well as DNS properly. Mails are sent from our mail server properly, but all the mails are listed in the spam ...
-1
votes
1answer
61 views

Sendmail (or postfix or somebody) not speaking SMTP

I've got a Linode Debian server which tries to send email (normally through PHP, but mail from the command line doesn't work either). But the mail never arrives successfully. My two clues from people ...
0
votes
3answers
117 views

Certificate on port 25 when trying to secure SMTP with POSTFIX

Background I think I am close to getting my POSTFIX setup to my liking. I've run some SMTP online checks and my SMTP passes all the basic security tests. I get a certificate warning in Thunderbird. ...
1
vote
0answers
45 views

google apps mail error

In recent months, we have big problems when we send email on our own mailing list (for safety, I'll call our domain name example.com ^^ ) staff@toto.com. All users receive this kind of mail back from ...
-2
votes
1answer
76 views

gmail blocking postfix relay [closed]

Here is partial postfix config: relayhost = [smtp.gmail.com]:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous ...
1
vote
1answer
632 views

Why is my mail stuck in the queue with the status “retry” in Exchange 2003?

I have been having a problem recently where some of our mail is not getting to clients. I looked into the Message queue on my SBS2k3 server and noticed that several recipients are showing up in the ...
0
votes
2answers
342 views

Capture Outgoing Email to One Mailbox or Account on Linux

I am looking to see if anything exists that would allow us to capture all outgoing email on a machine -- for example, in a staging environment -- and drop it in a single place, which ideally would be ...
1
vote
4answers
486 views

Can this SMTP Error be the Developer's Fault?

I have an error message getting returned to me from a website which would appear to be something wrong with the Server side. However, this server works for all other sites on the box. Is there a ...
-3
votes
2answers
37 views

Exchange server accepts email without authentication. Is this a misconfiguration?

I am a user on a network with an exchange server and there is an HP scanner/email machine that can send emails with scanned docs as an attachment from any email address without authentication so I ...
1
vote
3answers
706 views

Setup Postfix as a null client?

I'm having a bit of trouble setting up postfix as a null client and have some questions. I'll be aiming to use SMTP as this is what most web applications use as a way to connect to the email server. ...
0
votes
1answer
21 views

Exchange 2013 SMTP reply error not being sent

We are scanning to our exchange 2013 server from a scanning application that uses smtp, in the past when the mail exceeded the smtp size limit it would send an email with a link instead of the scanned ...
0
votes
0answers
28 views

The Remote Certificate is Invalid According to the Validation Procedure [closed]

Seeing this error on all but ONE machine in the building. One PC is accepting the certificate and all clients are denying it. Any reason this wouldn't be domain wide?
0
votes
1answer
37 views

Postfix with external SMTP

I'm trying to install Request Tracker and configure it to use an external SMTP server to sent mail notifications. I've already put postfix to send emails using this tutorial, but it keeps sending then ...
0
votes
2answers
25 views

Make exim accept mails to be redirected only when they can be sent

I run a small mail server with all the usual functionality: Sending of local mail, receiving mail for local folders, redirecting mail according to alias and a mailing lists. The redirections go to ...
1
vote
1answer
2k views

What is a good SMTP server for testing email system on Windows [closed]

I need a simple "fake" SMTP server or decent real SMTP server than can be configured to just dump all the mail it receives. I've tried Dumpster and it does nothing but error out on me. (I'm not much ...
12
votes
8answers
8k views

How to setup a fake SMTP server to catch all mails?

I'm looking for an smtp service that essentially obeys the RFC, except rather than sending mail it simply logs to a file [date] sent mail to <address> Or whatever. I can bash this together ...
1
vote
2answers
2k views

Postfix: Using google apps for smtp errors [duplicate]

I am using postfix and need to send the mail using google apps smtp. I am getting errors after I thought I had set everything up correctly: May 11 09:50:57 zedsaid postfix/error[22214]: 00E009693FB: ...
1
vote
3answers
2k views

POSTFIX main.cf permission denied

I am trying to set up a postfix server for smtp relay. Centos 5.5 I have followed http://mhawthorne.net/posts/postfix-configuring-gmail-as-relay.html but am getting a FAILED error when trying to ...
2
votes
1answer
47 views

IIS SMTP TLS encryption issue

I enabled TLS in IIS SMTP Virtual Server with a self-signed server certificate. Made sure that the certificate has the FQDN of the server. Checked the TLS encryption checkbox in Virtual SMTP > ...
2
votes
2answers
36 views

The benefit of different SIP and SMTP domains?

I was wondering if there was an advantage of having a different Lync SIP domain name from the Exchange SMTP domain name? I could see the disadvantages, but I'm trying to understand the real world ...
0
votes
1answer
49 views

Postfix: delivering “local” mail to GMail, but sending other mail

I need to set up a server to send messages to a few different people automatically. The recipients are at two different domains, let's say mydomain.com and otherdomain.com. The messages need to come ...
0
votes
1answer
966 views

Postfix SASL SMTP

I am getting an issue when trying to send out email on 465 secure SMTP with a Postfix + Courier with MySQL virtual users. I am able to connect with IMAP secure and download, and I can also send mail ...
0
votes
1answer
288 views

Windows Server 2012 R2 IIS SMTP Server Will Not Send Emails

I have an existing SMTP server on our network that is used to send emails from a variety of printers, applications, etc... I have installed the IIS SMTP Server on a new Windows Server 2012 R2 server ...
1
vote
5answers
3k views

Help! Linux server under SMTP SASLAUTHD attack!

My linux sendmail server is being forced out of commission by a flood of invalid smtp saslauthd logins. Steady stream of PAM auth errors logged for saslauthd in messages. I have searched and searched ...
0
votes
1answer
77 views

Postfix not sending authentication when relaying to local smtp server

I have been trying to get my postfix server to relay all of my message to a local SMTP server. As far as I can tell I have everything set up right, but I get a 550 Authentication error. My local SMTP ...