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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7 views

IIS SMTP to create emails as file

Is it possible to configure IIS SMTP to receive emails from client and store into a file? Yes? How? My company does not allow email communication on our secure domain (long story). So in order to ...
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0answers
8 views

Axigen SMTP Server - Disabling 550 Error Messages

I was performing some SPAM Testing on an Axigen Server, when I discovered a flaw which I would like to know if it can be disabled. On the System I was testing, the Server will spit out 550 Error ...
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1answer
23 views

Risk of compromised Amazon SES SMTP Credentials?

I host www.foo.com for a client. The website sends emails via postfix which has my Amazon SES SMTP Credentials configured and my SES has foo.com as a verified domain and this all works fine. Now ...
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1answer
53 views

DNS Setting for POP3 and SMTP email [on hold]

I'm new to server configuration, I have used rented webservers a lot, but I tried venturing myself with a VPS to run my own web/email server. All is good, I installed VestaCP to help me with dealing ...
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votes
3answers
196 views

What is the sendEmail equivalent on CentOS 7?

I am trying to follow the steps below. But there is no sendEmail on CentOS 7. I have looked at a few alternatives like Postfix, but I am not sure of the script commands. Alternatively you can use ...
4
votes
3answers
58 views

Foreign mail server returns “502 Command not implemented.”

I am using Postfix to communicate with foreign server and send a mail. Every time when I try send mail using Postfix, I get this error: (host mx2.seznam.cz[77.75.76.32] said: 451 Local Error (in ...
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votes
2answers
18 views

okay to allow any outgoing port for sending mail

I have a small app on my centos6.6 server i am running that allows the user to send an email on a custom port and I am allowing any port to be used. Is there any security risk for allowing this app to ...
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votes
0answers
22 views

Exchange 2013 Incoming email not received with Anonymous Users Disabled

I have a Exchange 2013 server deployed in my Active Directory network that fails to allow incoming email from outside the domain when 'Anonymous Users' is turned on from the Receive Connector in EAC ...
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0answers
23 views

Exchange 2013 Receive Connector Scoping and Open Relay

I have an Exchange 2013 server which was a victim of spam infiltration, and the exchange server was being used as an open relay for unauthorized users (and domains) to remotely send spam. I have done ...
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votes
1answer
49 views

Postfix: Fall back on SMTP relay that has internet access

I have a scenario where I have: Postfix server M (Stores mail) Postfix Server A (Relays mail using internet connection IA) Postfix Server B (Relays mail using internet connection IB) Internal DNS ...
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votes
1answer
28 views

Exim4 server setup and configuration with remote SMTP

I am trying to setup exim4 server with remote SMTP server. Here is my configuration for Exim4. dc_eximconfig_configtype='smarthost' dc_other_hostnames='test.com' dc_local_interfaces='127.0.0.1;' ...
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votes
1answer
35 views

I have seperated my mailserver from my webserver and now my contact form will not send mail

I have a website (www.example.com) which is hosted with NAME.COM and I also have Exchange Email account (which uses the same domain - admin@example.com ) that is hosted with Crazy Domains I have ...
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votes
1answer
40 views

PFsense postfix troubleshooting - SMTP headers [closed]

I am trying to setup google as mail relay but running into some troubles. I get an error that 550-5.1.1 The email account that you tried to reach does not exist My custom main in pfsense looks ...
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votes
1answer
30 views

Mail Delivery Failure - Reason: 571 Delivery not authorized, message refused

Good Morning, We have changed our external IP Address of our mail server earlier this week and ever since we are getting bounce backs from email addresses we can normally send to. One of the error ...
2
votes
2answers
63 views

Postfix seems to send spam

I recently discovered this in my postfix-log: Aug 4 11:09:12 mail postfix/smtpd[71597]: connect from unknown[59.88.35.206] Aug 4 11:09:14 mail postfix/smtpd[71597]: Anonymous TLS connection ...
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votes
1answer
16 views

java - how to limit sending email by 3rd party tools?

I have a (Win2008 R2) box running the Jenkins continuous integration server. It's a java program running as a Windows service. The command line looks like this: > "C:\Program Files ...
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0answers
25 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 ...
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0answers
10 views

SPAM suspected - Internal relayed E-Mails from SAP over Exchange fail frequently [duplicate]

our SAP system is running on UX. Through some transactions, users are able to send out E-Mails to external customers. The UX system sends the e-mail via standard SMTP to our internal Exchange Relay ...
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1answer
35 views

Connection refused by [127.0.0.1]

I am not very good with email servers. Here is what I need: I have a mailbox at fastmail.com with my custom domain (let's call it example.com). Now I want to set up my web server to relay emails ...
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2answers
35 views

Is smart hosting to an A record a violation of RFC-5321 section 1?

I have a sendmail server configured to smarthost to a downstream resource. The configuration is currently: define(`SMART_HOST',`relay:[vip.example.local]')dnl Since it's sending the A record for ...
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2answers
39 views

Postfix sender acces restriction - Security breach?

We encounter security problems with our mail server and would like some advice. The story behind it On our mail server (Postfix 2.9.6 + Dovecot 2.1.7) we would like to be able to create restricted ...
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0answers
33 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 : ...
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2answers
49 views

google compute enging postfix relay through gmail

I would like to send directly through gmail, since we have google apps and use gmail as our domain email. I would like to get rid of sendgrid so I can possibly not be marked as spam. I found this ...
4
votes
0answers
32 views

How Does Low Volume Affect (esp. live.com) Email Deliverability?

I've been sending emails for years with out any serious reputational shocks, but with low IP volumes (no bulk mail or automated transactional email), even with multiple Domain names. My Gmail ...
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2answers
54 views

smtp blues - external emails works, internal does not

I have 3 domains hosted on a remote server, but I am using other postfix server for SMTP only. So, I have two servers: mail.domain1.com - remote mail server, storing mailboxes and used for IMAP ...
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votes
1answer
14 views

How to configure exim4 to orelay email from a specific IP?

I am attempting to set up an SMTP relay server, using exim4. However, I have only one IP that I want to be allowed to send email through my server. Is this done using iptables or some configuration ...
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2answers
63 views

postfix authenticate disable smtp port 25, but 587

I am trying to make postfix not to auth users on port 25 but only on 587 and using STARTTLS. I have tried may different confs, but no success so far. main.cf: ... smtpd_sasl_auth_enable ...
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0answers
41 views

IPTables, route specific port through VPN

I'm running my own mail server at home on a dynamic IP. Dynamic IPs are often blacklisted, so I currently send out mails through my provider's relay. I want to change that to sending mail directly, ...
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1answer
36 views

postfix SMTP outgoing gateway server, Software RAID1 vs RAID1 + RAID 0 on 2 disks

I have this old smtp server that is currently running Windows 2003 and with EOL I want to move it to something that will continue to get security upgrades but at same time I want to improve ...
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0answers
22 views

Postfix SMTP authentication FROM [duplicate]

I have a Postfix server with authentication running. However I recently found out, that anyone authenticated may send mail from any account. Meaning user1 is logging in and may send the e-mail from ...
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0answers
49 views

Exchange sending QUIT after 220 ESMTP Status Ready

I am hoping someone can help with an issue we are experiencing between our smart host and our Exchange 2010 Server. When our smart host tries to deliver email to our exchange, we are met with a 451 ...
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1answer
60 views

Why don't I receive the emails forwarded by Postfix?

My desired Postfix configuration is to forward all incoming mails according to virtual aliases and be able to send outgoing mails via SMTP and TLS. Sending already works, but the forwarding does not. ...
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1answer
63 views

IIS/SMTP - Disable SSLv2 [duplicate]

I am trying to disable SSL2 on our IIS/SMTP server. We are using a Windows Server 2008 R2 Enterprise (64bit). We use the IIS6 Manager to manage the SMTP virtual servers. I have attempted numerous ...
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votes
1answer
111 views

postfix/smtpd lost connection after AUTH from <server>[ip]

I try to send mail from a private LAN server to my private postfix server and I get this error, but I can't find its meanning: # /var/log/mail.log Jul 8 15:02:50 mail-srv postfix/smtpd[18222]: ...
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0answers
21 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 ...
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votes
1answer
54 views

Implications of removing session size limit from SMTP Virtual Server

I am running into an issue in one of our applications whereby our SMTP server rejects mail: System.Net.Mail.SmtpException: Exceeded storage allocation. The server response was: 4.3.1 Session size ...
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1answer
43 views

Sending an email to multiple recipients via a mail relay, while hiding the recipients

Our software sends emails using Exchange. Typically each email foes to multiple recipients and we just send one email with multiple "to" addresses. We're moving to an SMTP-based email relay, where we ...
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votes
1answer
87 views

How to add allowed relay IPs for Windows SMTP using command line or script

I have a long list of IP addresses I need to add as allowed relays to the built-in SMTP service on Windows Server 2008 R2 (IIS 7.5, but SMTP uses the old IIS 6.0 manager) I know how to add allowed ...
0
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1answer
66 views

SMTP: Setup TWO servers to receive / store emails the same at the same time

My question aims to clarify whether I can get a setup running, where Server A on 1 site receives email as is received at the same time by Server B on site two. The requirement is to have Server B be ...
5
votes
1answer
221 views

Windows Server 2012: Cannot install SMTP-Server, system always requires restart

I'm not able to install the "SMTP-Server" feature on a Windows 2012 server. The installation process always fails with a "restart required" message. After the restart and (re)starting the SMTP-Server ...
0
votes
1answer
33 views

Server 2012 Virtual SMTP Server not delivering messages

I am having a problem with my Virtual SMTP server on Windows Server 2012 Standard. I recently ported a clients Classic ASP hosting to a new server from a Server 2003 Standard box where the Classic ...
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votes
1answer
43 views

Forward all SMTP traffic to anti-spam server except for authenticated SMTP?

Historically, we have handled SMTP traffic across a handful of multipurpose servers each with their own local spam-fighting stack. We've grown and this is no longer feasible to maintain. Now we have a ...
0
votes
1answer
69 views

Outbound SMTP email not being delivered, but still disappearing from the queue and pickup folder

After setting up my smtp server on a Windows 2012 server r2 on port 587. I tested the email functions by creating a text file labeled email with the following code inside: From:admin@mydomain.com ...
-1
votes
1answer
15 views

Hosted email routing service while downgrading domain [closed]

I'm at a situation where I need to close a domain on Google Apps due to inactivity, while closing the domain I would be interested to preserve emails sent to that domain. I understand that my ...
0
votes
1answer
199 views

New CentOS 7 server - Sending mail from a PHP application

Apologies for the newbie question but i'm hoping someone can provide me with some help/steps. I am in the process of migrating a website from a managed shared hosting account online to a new CentOS 7 ...
0
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0answers
29 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 ...
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votes
1answer
17 views

TLS for outgoing mail (following ISPmail) not working

I built my mailserver on a vserver after the ISPmail tutorial (https://workaround.org/ispmail/wheezy) (which is awesome). The only remaining problem is that it does not seem to use TLS with outgoing ...
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votes
1answer
40 views

How to process sendmail queue when 25 port is blocked? [closed]

I have one VPS which forwards e-mails from one mailbox to another. Unfortunately ISP have blocked 25 port last week and since then I can't receive any e-mail from it. According to mailq there are ...
0
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0answers
37 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 ...
1
vote
1answer
206 views

How to unassign self-signed cert from SMTP on Exchange 2010?

We have a GoDaddy wildcard certificate that we have installed into Exchange 2010 and is successfully used on IIS connections for OWA. We have assigned this certificate to the SMTP Service as well as ...