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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Outlook 2011 (Mac) refuses to send email, error -17092. All other clients work [Solved]

Having spent a while debugging this, I thought I'd post here so others can save some time. The error from Outlook 2011 is: "The SMTP server does not recognize any of the authentication methods ...
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212 views

Forcing IIS virtual smtp server to verify outgoing TLS certificate

I am in a situation where a web application is using the IIS virtual SMTP server to send out email. The IIS virtual SMTP server is then configured to send all mail out through a smarthost, over TLS ...
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163 views

How can I change the default email address format type for replies on blackberry?

Exchange 2007 BES 5.0.x Hello all, I'm trying to help a colleague with a technical issue. I apologize in advance for not having all of the information. I'm looking for some advice on where to ...
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23 views

Exchange 2010 – Multiple Smart Hosts

A client has Exchange 2010 which, up to now, had a single internet connection. They were sending email via a smart host run by their ISP. It was working OK. We have put in a second internet ...
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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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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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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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397 views

Office 365: 'client smtp submission' suddenly starts failing. How to diagnose client auth error?

Since a few days, my application fails sending SMTP email. The app is in fact a scheduled task (which is running on my local machine, written in C#, using SmtpClient) and occasionally needs to send ...
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131 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 ...
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77 views

Outlook on Exchange: Why does it mangle return address for some email?

We have seen this too much in multiple Exchange environments, and need some guidance. When we email (using simple mail client app) to certain Exchange/Outlook sites, when those sites hit Reply, our ...
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19 views

Is it possible to prevent emails being sent from an address absent from the AD user's account?

I'm using Exchange Server 2003 on a Windows Server 2003 which is also a domain controller. If a client connects through SMTP using his AD username and password, he can send email from any email ...
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68 views

Custom Transport Agent: How do I collect NDRs and all other undeliverables in Exchange 2010 from the Postmaster?

I'm trying to collect all NDRs in a single mailbox for all invalid recipients, and anything that fails for any reason. I have a custom transport agent, that I've written myself that appears here: ...
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81 views

Configure postfix to limit total number of connections from any and all SMTP clients in a given time period?

I am trying to figure how to configure Postfix to operate within the requirements given by Spamhaus for free usage of their DNSBLs (http://www.spamhaus.org/organization/dnsblusage/). They specify that ...
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156 views

Exim SMTP Smarthost Setup

I used these settings to set up exim to use gmail as a smarthost, which worked. However, I don't seem to be able to use these settings against other smtp servers, such as Yahoo or Fastmail (both with ...
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53 views

Can someone explain SMTP Callbacks when BATV is enabled, and when to issue the verification?

This Wikipedia article describes how SMTP verification of the MFROM may have issues if BATV is enabled. Servers that reject all bounce mails (contrary to the RFCs). To work around this problem, ...
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94 views

4.4.1 Timeout in 10 minute intervals SMTP on batch email jobs

I am running a job that uses SMTP and it can run in excess of an hour, emailing the entire time. It's not my code but a workflow based app so I just get a form to configure the mail server, subj, msg, ...
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141 views

Fetch all Mail from an IMAP server with Postfix to distribute on local IMAP server

The situation: The constellation: We have a managed, dedicated server from a professional provider. We currently have Tobit David.fx server in use within our local network which fetches all E-Mails ...
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337 views

What are the values of Exchange's XSHADOW and XQDISCARD commands?

Shadow redundancy is an Exchange-specific feature (beginning with Exchange 2010) that provides a measure of fault tolerance when relaying email messages with SMTP. The sending Exchange server sends ...
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124 views

No more emails being received for user from an email sender

I've set up a Postfix installation based on http://flurdy.com/docs/postfix/ with modifications where I felt was sensible. Emails are being received fine until some users simply no longer receive ...
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50 views

Adding real SSL to SMTP mail

I have a domain that I check my SMTP mail on. For PCI reasons for a different domain on the same server, SSL is forced for mail. Now that the forced SSL is in place, I can no longer check my SMTP mail ...
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162 views

Postfix: Modify sender address based on recipient

We have a Postfix server that receives mail from our application servers. Senders are in the form user@host.fqdn (where host.fqdn can vary, depending on source server) and recipients can be internal ...
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723 views

530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is ...
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240 views

IIS 6 Smart Host Outbound Security

I'm using the IIS 6 smart host setting to forward all email sent through IIS to SendGrid. It works fine if I set the Outbound Security and smart host settings at the top level of the Default SMTP ...
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137 views

Disable local delivery ONLY for authenticated users in Qmail

We are moving some mailboxes and servers. I'm looking for a way to use remote delivery (with normal MX lookup) instead of local delivery ONLY for authenticated users, in Qmail. connection to port 25 ...
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263 views

Stop IIS SMTP Server from sending “Delivery Status Notification (Failure)”

I have set the BadMail directory and the 'Send copy of Non-Delivery Report to' fiels is empty but, somehow I am still receiving the failure messages. Is the a way to stop the failure messages?. I am ...
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151 views

Mail smtp server configuration for PHP and RHEL

I'm running WordPress on an intranet VM and I need all outgoing messages to reach a remote smtp server. In php.ini there is this specification: [mail function] ; For Win32 only. SMTP = localhost ...
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253 views

How to setup multiple postfix servers for one domain

I was wondering how to setup multiple postfix smtp servers (mx1.mydomain.com, mx2.mydomain.com, ..., mxN.mydomain.com) for my domain. I've a postfix + courier with virtual users already running, but I ...
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383 views

Exchange 2007 and 2010 Journal Messages Stuck In Queue

I have a simple setup of 2 e-mail servers. My Exchange 2010 server, MS2010, is setup to forward all e-mails that it receives to the journaling mailbox. The journal mailbox is located on my Exchange ...
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273 views

How to define mail from and host settings in Websphere 6.1 for Java application

Working with some older WAS 6.1 hosts (fix pack 25), and have a java app that sends mail from one host with a mail from field: nobody@nosuchhost.nosuchdomain.com ...
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63 views

Ariel will not send through our SMTP server

I'm currently working at a university that uses Ariel software to send ILL documents to teachers at other universities. They do this by e-mail the documents to the users. We recently switched from ...
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167 views

Forwarding emails from a domain

I generally use Google Apps to handle email domains. I'm unfortunately stuck in an infinite loop with Google [1] for one the domains I recently picked up. Right now I use Zerigo's awesome DNS ...
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529 views

Problems when using IIS SMTP Pickup Service

In my website, I send emails from my website to IIS SMTP Server (using the pickup drlivery method). IIS SMTP server is set up to forward the emails to a local mail server, XMail Server, running on the ...
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22 views

determine which application is sending mail via postfix

I would like to track down which applications (other than PHP, which I can track via mail.log setting in php.ini) are connecting to and sending email via postfix. Is this possible via any log ...
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7 views

syslog-ng 3.5 flush_lines not working with smtp

What I want: automatic emails every time someone successfully logs into my Ubuntu 14.04 LTS server. /var/log/auth.log gets 2 lines written to it every time I login. Example: Jul 22 13:55:49 server ...
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17 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 ...
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29 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 ...
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32 views

Postfix: Relay Access Denied, Reverse DNS Mismatch Error

I have dovecot and postfix installed to handle emails. I have used telnet to check imap and it appears to work fine but when i run telnet mail.domain.com smtp i get 554 5.7.1 <user@gmail.com>: ...
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29 views

drop smtp live connection

So the problem is that I think my server got DDoS attack with SMTP packet (my mail server). What I can see is that the attacker abuse the smtp_connection_cache. The attacker keep connections (smtp) ...
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42 views

Exim/Cpanel Email Headers

We have been trying to figure this out for a few days now and have been all over this board as well as a few others, and this refers to Received From and X-AntiAbuse: Primary Hostname headers. We are ...
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19 views

Plesk qmail-smtpd: how to relay mail sent FROM a certain domain through a smarthost

Running Plesk with the default qmail-smtpd and would like to bounce mail sent from one large customer through a seprate smarthost. I did some searching and it seems you can only decide which mail to ...
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58 views

Zimbra SMTP Reverse DNS Mismatch

I have a Zimbra email server. sending and receiving is fine, however When I use online tools to check that things are configured properly, I'm being told my reverse DNS SMTP Banner is wrong. ---- ...
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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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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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116 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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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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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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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 ...