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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Exchange 2003 mail non-delivery (NDR), spam activity? events 7002 & 7004

Windows Server 2003 Small Business Server SP2 Exchange Version 6.5 (Build 7638.2: Service Pack 2) This network has been neglected and has been having email problems for years and was on many ...
3
votes
1answer
76 views

Cannot set a default SMTP server certificate on Exchange Server 2013

I've an Exchange 2013 Server with two wildcard certificates, one for matching the internal AD zone and the other one with the public domain. The certificates are defined with those names: ...
2
votes
1answer
57 views

Sending mails from Gmail through my VPS (postfix, dovecot, postfixadmin)

This problem has been bugging me for a long time now and i want it to be fixed. On my VPS I have set up Postfix working correctly with postfixadmin and dovecot. (I can send (by terminal) and receive ...
2
votes
1answer
57 views

Catch incoming email and then deliver to original recipient on sendmail

in the company I work for there are a user that is making bad use of the email, but to have evidence of what he is doing we need to intercept all the incoming email to him and all outgoing email from ...
2
votes
1answer
201 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 ...
2
votes
1answer
718 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
1answer
2k 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 ...
2
votes
1answer
905 views

Configuring Monit to Send Mail through Office365

I'm trying to configure monit to send emails through Office365. Here's the relevant configuration: set mailserver smtp.office365.com port 587 username "username" password "password" using ...
2
votes
1answer
572 views

SMTP Event Sinks in Windows 2008 R2

We use a 3rd party software to send Bulk Emails. The software does not provide options to add Email addresses in BCC. However, as per Compliance Rules, it is necessary for us to add a BCC address to ...
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59 views

Exchange 2013 SP1 on WIndows 2012 R2 SMTP Issue

I have Exchange Server 2013 SP1 installed on Windows 2012 R2. This is a clean install on a new stand alone server. I have added 1 user account into Active Directory and have the receive connectors ...
0
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0answers
48 views

Email connection timeouts and Barracuda

I am running into an issue with Barracuda's new cloud-based Email Security Service (ESS) that several partner companies have switched to recently. We are unable to email any domain behind the ESS ...
0
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0answers
33 views

mailx is working to send mails to external network. But mutt is not working?

I have a server with postfix service running. I am able to send mails to external network using mailx. But with mutt, I can only send mails to users inside network. What I might be the issue? ...
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0answers
292 views

SMTP connection from closed by QUIT

2015-10-21 08:54:02 H=zeus.email-sent.net [66.241.99.248]:2594 Warning: Sender rate 1.0 / 1h 2015-10-21 08:54:02 H=zeus.email-sent.net [66.241.99.248]:26166 Warning: Sender rate 2.0 / 1h 2015-10-21 ...
0
votes
0answers
33 views

Postfix mailserver only allows sending from ONE email(support@domain.tdl), and only THAT email for THAT domain, but receiving from outside is fine

As the title says, I can only send emails(through webmin + thunderbird) using the support@maindomain.de email, but using other domains/accounts like blah@maindomain.de, wont send it(even though webmin ...
0
votes
0answers
121 views

How to relay/forward mail from qmail MTA to Google Apps/Gmail?

I want to forward or similarly deliver mail for "user1@example.com" to a Google Apps mail account for "example.com" from the MX primary inbound SMTP server "example.com" (MTA is qmail). I want all ...
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0answers
158 views

sending email using gmail smtp is working when running my project inside visual studio only

I am working on an asp.net mvc5 web application and I have the following action method to send emails using gmail smtp :- [HttpPost] public ActionResult Contact(Contact c) { ...
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245 views

Email transmission delays between Gmail and our server

A few days ago I started setting up a mail server for our company: OS: Debian MTA: Postfix DNS: bind9 Firewall: pfSense Port forwarding for ports 25 and 53 through pfSense for passing on DNS and ...
0
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0answers
38 views

Two ips rotating each time an email is sent - iptables

I have two ips attempting to rotate each time an email is sent from server. The following commands say they are configured: sudo ifup venet0:0 ifup: interface venet0:0 already configured sudo ifup ...
0
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0answers
207 views

Certificate rejected by Exchange (SubjectMismatch Chain Validation) works with openssl s_client

I am trying to establish a TLS connection between Exchange 2013 and a non-Windows SMTP server. An internal Windows CA was used to generate the certificates for Exchange and the SMTP server. The SMTP ...
0
votes
0answers
107 views

mailjet with brimir (open source Ruby project) on debian doesn't send mail

I tired of searching a tip to be able to send mails with mailjet on my debian. I configured a dashboard for tickets (Brimir, Ruby open source plateform) Here is the link : ...
0
votes
0answers
32 views

Windows Smtp Server administrator login

I newly setup Windows SMTP Server on Windows Server 2012 R2. Any account exception Administrator can send email. But in the case of Administrator account, mail server said "535 5.7.3 Authentication ...
0
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0answers
52 views

Updated hostname of server but old hostname still appearing appearing in Postfix logs?

Been having some trouble with emails bouncing when being sent to certain addresses from our CentOS 6.4 Media Temple DV server. I am no expert but after checking the mail logs it appeared that they ...
0
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0answers
76 views

Mail server still BLACKLISTED after fix the issue

I have an Exchange 2007. CBL has blacklisted me because: This IP address is HELO'ing as "localhost.localdomain". If you test and helos properly means something OTHER than your mail server ...
0
votes
0answers
113 views

IIS 6 SMTP service stops working after server restart

I'm currently wrestling with IIS6 SMTP service not working properly when the server is restarted. This has only just started happening in the last month and struggling to pin point the issue. I ...
0
votes
0answers
188 views

CentOS Postfix/Dovecot status deferred conversation with 127.0.0.1[127.0.0.1] timed out while receiving the initial server greeting

Linux Kernel: Linux 2.6.32-504.16.2.el6.i686 on i686 RAM: 6GB OS: CentOS 6.6 Postfix 2.6.6 Dovecot 2.0.9 Relay Host Verizon Stunnel through 127.0.0.1:2525 Webmin 1.750 Virtualmin 4.17.gpl Multiple ...
0
votes
0answers
116 views

Major Mail Issue - SMTP Local Server Not Working

My database (MySQL), web server (IIS 8 ) AND SMTP server (IIS 6) are all on the same dedicated server (Windows Server 2012) that I'm honestly renting for a bit of system admin practice. I followed a ...
0
votes
0answers
41 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 ...
0
votes
0answers
378 views

Local Xeams standalone server not sending emails?

I want to setup a Ruby On Rails development environment where I can develop an application that can send emails. I can use the smtp.gmail.com free server but I do not want to use it, but rather I want ...
0
votes
0answers
51 views

Can't connect to any SMTP server from neither of the Macs in the network

For a few days now we have been unable to send out any E-mails from various Macs in the network to various SMTP servers. No changes to any hardware or software have been done in the recent time that ...
0
votes
0answers
337 views

SMTP proxy (relay) with SSL

Short question I need some kind of SMTP proxy server which does not verify passwords and directly pass credentials and data to a target server. The target server uses self-signed certificate so I ...
0
votes
0answers
361 views

Use nginx as reverse proxy for outgoing mail

We have a production server running a singlepage web-app and a separate proxy server, for security reasons. Every request to our web-app is handled by our reverse proxy (nginx) on the proxy server. So ...
0
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0answers
50 views

Exchange 2013 Outlook “Send to cache”

Having some trouble with users changing AD accounts but their primary SMTP address is moved to the new account. Let me explain: User Andersson1 gets a new AD accout because he changes department and ...
0
votes
0answers
209 views

Server sometimes doesn't receives e-mail, with error 451

One of my customers tried to send me an e-mail with his e-mail address that I didn't received. He received a Delivery Status Notification (Delay). I only received the message 2 days later In the ...
0
votes
0answers
102 views

hotmail isn't receiving mail from my server

Hotmail is block all mails (not send to Junk, it really block!) send from my VPS server (even if I send directly from roundcube, for instance). I checked all configs and seems that all is ok. Works to ...
0
votes
0answers
104 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 ...
0
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0answers
430 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 ...
0
votes
0answers
206 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. ...
0
votes
0answers
8k views

550 5.7.1 Message Rejected due to content restrictions

I have a server that for some reason, out of the blue is now having a huge amount of its email being rejected, coming back with 550 5.7.1 NDR's or various derivatives thereof. This just started ...
0
votes
0answers
201 views

SMTP on Windows Server 2008

Okay, i know that the built in SMTP server role inside Server 2008 is a little beleaguered; however, using resources here (stackex) and from msft I've worked through the issues I've been able to ...
0
votes
0answers
33 views

How to configure SMTP to recognize a group

I'm using a windows server. I installed IIS SMPT server and using it. I have no problem when I send a mail to individual id. But I get an error when trying to send to a group. InternetAddress ...
0
votes
0answers
46 views

Mail server in the middle responsible for translating from one domain to another

The title is a little confusing. We have an internal mail server that can be used to send mail. This internal mail server is only accessible from within our firewall unless we use the mail server's ...
0
votes
0answers
366 views

SMTP fails with Status: 5.3.5 when sending to a local mail server

In our network, we have na IBM Lotus Notes server, which handles emails for basedomain.com. Recently we introduced a new IIS Smtp server just for sending automated emails. The Smtp is configured for ...
0
votes
0answers
186 views

SMTP relay anti-relaying and LIMIT/QUOTA

I need some help to face this problem. I have 2 LAN connected to the same router. My first LAN is the office LAN and left on the internet with one public IP address. My second LAN is the datacenter ...
0
votes
0answers
358 views

IIS 7.5 SMTP E-Mail Queuing when SMTP Server is unavailable

I have a Windows 2008 R2 server running IIS 7.5, that also has the SMTP Server feature installed. In the IIS Manager, SMTP E-mail is configured to deliver to localhost. The server barfed yesterday, ...
0
votes
0answers
342 views

SMTP relay to Exchange Online - won't work without remote domain smarthosts?

We've got an on-premise SharePoint farm that sends and receives email via an SMTP instance on one of the servers which relays to our on-premise Exchange. We're in the middle of a migration to ...
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votes
0answers
35 views

I think My Email Server Got Hacked

Hi almost everyday my mail server is getting relentlessly attacked. Because of that, several of my users send out spam email without their consent. I've already setup fail2ban but they're kept ...
-1
votes
0answers
6 views

Exim to forward all mail to mailin

How can i setup exim, to store mails regulary but to send copy of them (forward) to local mailin server runinng on port 9025 for example? Same question is for sending mails, i want to send them to ...
-1
votes
0answers
42 views

Postfix does not accept mail from my client or other servers

My setup: Primary machine is Windows, and I'm using Mozilla Thunderbird as my email client. IP 192.168.1.99 Server with 2 network cards running Arch acts as my router and firewall (with Shorewall). ...
-1
votes
0answers
27 views

Setting Up Zerospam

Edit: I'm trying to open up port 25 for public access. My boss and I are at a loss. We are setting up Zerospam for a client of our and we can't seem to figure out how to configure it through ...
-1
votes
0answers
23 views

Cannot connect to postfix from Thunderbird

I have Thunderbird set up with IMAP and SMTP. IMAP (dovecot) works fine but SMTP (postfix) does not work. When I try and send an email via the postfix server I get the following in /var/log/mail.log: ...