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

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Mails get rejected with error code 550 5.4.1 different domains

I've a online tool where different people can create things and other people can book it. So there are three mail adresses involved: My customer: customer1@gmail.com The customer of my customer: ...
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Automating email sending by using telnet & FTP on OS X CLI

Running the following script: #!/bin/bash cvs_domain=abc.com cvs_mail_server=mail.${cvs_domain} cvs_port=25 telnet $cvs_mail_server $cvs_port<<_EOF_ EHLO $cvs_domain MAIL ...
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21 views

How can I know whether my Windows SMTP server gets connected to its recipient server?

I have a Winodws SMTP virtual server on Windows 2012R2. It sent many emails to someone@vt.edu. However, recipients never get sent emails. I contacted the technical support at Virginia Tech and they ...
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18 views

Every other Thunderbird outgoing email fails SSL handshake

It takes me two tries to send any email with Thunderbird because it gives me this error on the first try: Sending of the message failed. The message could not be sent using Outgoing server ...
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12 views

Seamonkey Email Client, YahooMail SMTP Outgoing Mail

I created two accounts in SeaMonkey, one gmail and 1 yahoomail. When I tried to send email from Yahoo (2nd account), a copy of that email was created in the Sent items (of course). But the problem ...
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1answer
21 views

Can you close the SMTP port and still send emails?

Is an open SMTP port necessary when sending mails from an SMTP server? From the design perspective, in a client-server architecture, this would not be needed, since SMTP server acts as a client ...
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54 views

Unable to connect to SMTP server 421 connect error 1460

I have a 2mbps ADSL connection with MWeb on a new account and separately, I got a free 1GB capped account with Axxess some time ago. When connected to MWeb's network, I'm not able to connect to any ...
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1answer
104 views

Sending email through telnet SMTP

After I connect to one of gmail's SMTP servers (via windows cmd), when I try sending mail to myself, it keeps giving me the same error. 220 mx.google.com ESMTP u3si16129057wmg.22 - gsmtp ehlo b ...
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40 views

Telnet to smtp.gmail.com 25 timing out inside vagrant box

Vagrant 1.8.1, Virtualbox 5.0.16, Windows 7. Vagrant using hashicorp/precise64 image. No modifications done to Vagrantfile. Using the default NAT networking. vagrant@precise64:~$ telnet ...
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1answer
35 views

postfix: how to generate a bounce

Is there a way to generate a bounce programmatically? The only thing I found is "-N" flag in sendmail wrapper and bounce_template_file configuration parameter: /usr/sbin/sendmail -N failure But for ...
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29 views

Configure Sendmail as Secondary/Anonymous SMTP Solution

I have a scenario where I want to allow my clients a secondary SMTP service, e.g. they are hosted on SERVER1 and using the same server as a primary mail server, Now I want to allow them to use the ...
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89 views

SMTP relay options

I work from home and use an email client for all my work email. Up until yesterday, I was able to use my ISPs SMTP server (Verizon FiOS) to send my work-related email with any from-address I liked as ...
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4 views

Configuring postfix to work with TLS

I have a couple of questions regarding postfix config. First of all I need TLS as of the perl smtp plugin mediawiki uses, forces TLS authentication. Will it work on 25? Or what's the advised port? ...
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6answers
667 views

What diagnosis steps can I do if my emails send, but are not received, not even as spam?

I have a problem where all emails to certain recipients send but never arrive, not even as spam, with no errors, while emails to everyone else work fine. I'm stumped and am looking for ways to ...
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19 views

Google IMAP Login

I am trying to setup Outlook 2016 with my Google Account (Because I hate using Inbox for my emails and cannot get away from Google's stronghold). Now I have 2 Step Authentication enabled for my ...
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43 views

Roundcube not sending email via smtps

I am running Roundcube 1.1.4 on Debian Jessie - it all works OK apart from sending emails via my SMTPS server (which normally works OK). I use self-signed certificates. No additional Roundcube plugins ...
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17 views

External mail from windows get rejected, local mail works

I have linux server with working SMTP server (postfix)... (I can send emails to gmail when connected to it via ssh) But if I send through bmail in Windows i get this in linux mailq: BB986640FC9 ...
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56 views

CentOS - Postfix rejects incoming mails

I have VPS with Centos 6 with Postfix, Exim and Dovecot. When I try to send mail from GMail to mail account from my server I receive following error in /var/log/maillog: Feb 3 13:36:29 mobilepro ...
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1answer
35 views

Giving each domain unique IPV6 address for posfix SMTP

Today I faced a problem after setting up postfix as my mailserver and sending e-mail to a gmail email, which responded me with the following message: Our system has detected that this ...
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2answers
55 views

Can't telnet into mail server

I have a machine running CentOS. From that machine I can't telnet into a mail server. From my local machine I can do the following command: telnet mailserver.com 25 From there I can't send emails ...
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16 views

Who should sign mail with Dkim?

I have an exchange server configured to use an external smarthost to send email. If I want to complete my messages with DKIM signature should it set to my Exchage server o may I ask to my provider ...
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43 views

postfix to send email from a client

I own a domain company.com. All employees in company have gmail accounts. The domain registrar already provides email forwarding, so if I were to send something to bob@company.com, it would be ...
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9 views

SMTP cache / proxy server for server fault protection

I am trying to find something that I would install on a dedicated server that would receive SMTP requests. This software would send theses requests to my STMP server, but if the server is not online, ...
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1answer
31 views

Multiple servers on one hardware?

I have built a website and have a domain. I want to host the site on my home server. I would like to set up email like an smtp server. Can I host my site and the smtp on the same hardware? If so, what ...
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1answer
19 views

Find out SMTP of organization o365 Outlook

I have been wondering how to find a SMTP host on an Organization/School Office 365 account. This is because "Mail Flow" blocks any messages to GMail, Hotmail, Yahoo, etc. If I can set up a program ...
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33 views

Mails from webmail ends in gmail spam - can I use smtp?

I finally managed to setup my cPanel mails so that I can send from SMTP and get the mail delivered (even on Gmail, yay!) However, every time I send from one of the webmail clients ...
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1answer
48 views

git-send-email Causes “Must issue a STARTTLS command first” Error

I am attempting to send a patch with git-send-email through my Postfix mail server. Unfortunately, whenever I do, I just get this error spat back to me: <recipient@example.com>: host ...
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6answers
6k views

Why do I need an SMTP server?

Why do I need an intermediate SMTP server to send mail? Why can’t my client (Outlook, Thunderbird) send messages directly to the recipient’s SMTP domain? For example, if I have to send an email to ...
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68 views

How to pass through credentials in SMTP proxy with Postfix

I want Postfix to proxy SMTP connections from MUA on my client to another outer SMTP server. Since the outer SMTP server requires the Postfix proxy to authenticate with SMTP-AUTH, So I set my MUA's ...
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1answer
32 views

Reject all Microsoft Office attachments

I have had enough of spam coming to my server with Microsoft Office attachments. No one I care about ever sends me Microsoft Office documents so I would like to reject (with a polite message) all ...
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27 views

Spam Gets Past Gmail Server's Authentication

Below is one spam example I received today in Gmail. The authentication referred to means that a username and password (to use Google's server) were correctly provided by 110.2.164.153 at some point ...
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52 views

How to keep messages from previous Thunderbird email account?

I had an email account on first hosting server with its IMAP and SMTP. The server has been cracked and now I couldn't read emails from it. I moved my doamin to another hosting server with another ...
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79 views

Just want to send email from my Windows Server 2012, what simple SMTP server to use

I'm trying to configure SMTP on my window server 2012. I do the same as mention here (http://www.vsysad.com/2014/09/setup-and-configure-smtp-server-on-windows-server-2012/). I am trying to send test ...
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1answer
116 views

Simple mail send on Ubuntu

I have been struggling with mail function in Ubuntu. My goal is to send a test email from a terminal with a command: echo "msg" | mail -s subject sample@domain.com. I have tried to install ...
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33 views

Application mail relay vs SMTP

I'm new to this technology and I wanted to understand how application mail relay differs from SMTP. What are the requisites in order to replace SMTP with AMR in an Intranet environment ? Regards
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1answer
259 views

Which of the following protocols can use multiple TCP connections between the same client and the server?

In one of the pairs of protocols given below , both the protocols can use multiple TCP connections between the same client and the server. Which one is that? HTTP, FTP HTTP, TELNET ...
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45 views

managing port 25 in windows 8.1 home and cable modem [closed]

A cable modem has port 25 blocked. Two computers are on the local wifi network managed by the cable modem. One computer is a windows 8.1 machine that sends and receives email using tools like ...
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1answer
735 views

Why can I authenticate to my gmail account neither from my printer, nor from my manually configured mail user agent?

I'm trying to set up a print that will send its scans by email. I created a gmail account specifically for the purpose. However no matter which way I configure the SMTP settings, I cannot get it to ...
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103 views

ssmtp error 501: Could not decode user and password

Im trying to send email from cron via ssmtp but get the error: Authorization failed (501 Could not decode user and password) ssmtp.conf: root=mail@mydomainname.com mailhub=smtp.zoho.com:465 ...
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2answers
91 views

Troubleshoot the reason for SMTP

'm unable to send the emails from my server, nagios.emoney.com, to relay host with smtp protocol. I took tcpdump towards, v-smtpgw5.ka.kasnova.net cmsmtp, and foudn the following ERROR:- 220 ...
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1answer
242 views

Connect to Email Server through VPN

So I'm trying to connect to an email server with a username and password but the only information I have is the user / pass and: PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 80/tcp ...
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74 views

Identify log file for SMTP that would indicate email sending errors

Some of our applications are sending emails via the local SMTP servers. If this local SMTP server was unable to deliver an email, we need to make sure an error is logged. Perform the necessary ...
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2k views

How to setup scan to email (without computer) for Brother Printer MFC 7860 DW

I have Brother Printer MFC 7860 DW and I want to scan documents from its scanner and send the scan directly to given email address, without using the computer again after setting up everything. I ...
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1answer
624 views

Thunderbird can't send emails - SMTP error

I've been using Thunderbird for a while now and for some reason, when trying to send emails via Thunderbird in a Outlook/Hotmail account, this error message is displayed: "Login to server ...
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82 views

SMTP from gmail webclient and sent folder

I want to manage my personal (gmail account) and company mail accounts (not a gmail account) together from my gmail webclient. I know gmail has no support to configure IMAP accounts for external ...
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34 views

Incorrect password on latest version, works on ESR, msmtp doesn't work

I can't login to my work mail server using the latest Thunderbird version (38.2.0), but it works with the ESR 17.0.11 version. The message that I get is something like "incorrect username or password" ...
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38 views

Cannot connect to specific mail-provider (IMAP/SMTP/CalDAV) on specific local account

I cannot connect to a specific mail provider using Apple's Mail (IMAP/SMTP), Calendar (CalDAV) and so on (Internet Accounts) on OS X 10.10.4. On trying to connect, I'm asked for my password which is ...
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10 views

Php mail not recieving

My issue is php mails aren't being received. so I have WHMCS on a server here and I am using WHMCS for service & client management but is only allowed on our company network so it won't be ...
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2answers
96 views

How can I find the name of an MSA server if all I have is the domain name?

Edit (it wasn't clear what I was asking): I wanted to send email to my Verizon address by submitting it from my home network to the Verizon MSA. So my question was: how can I find the name of an MSA ...
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1answer
144 views

Sending Mail on Windows 2008 R2

I have a single server, no AD installed, and I use it to allow my customers to connect via Remote Desktop and run a custom application. I've got a feature in the application that will send a report ...