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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58 views

Why Outlook, Hotmail and Live return 250 Mail queued for delivery, but they never deliver it?

Ok, i've been seeing this the last week, tought it could be gone in a few days by itself, since i wasn't blacklisted and my DNS entries are all ok, but when i try to send e-mails to some user at ...
3
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34 views

How can I explicitly disable TLS when sending to one specific recipient?

I have a SendMail 8.14 server deployed in the middle of an SMTP workflow (Outbound mail looks like Exchange -> SendMail -> Appliance -> Internet) I have TLS configured for the first three hosts. ...
2
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92 views

Does Google require TLS on port 587? Exchange 2010 SMTP has mail sent to GMAIL backed up in queue

Exchange 2010 SMTP has mail backed up in queue. Any email sent to Gmail sits in the queue while any email sent to another personal domain which has email filtering enabled errors, "asp.reflexion.net ...
2
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75 views

Getting “5.7.1 Unable to Relay” intermittently on mails sent to Exchange 2013

I have a helpdesk system that sends mails through the local exchange server. Until a few days ago, I never had issues with it. For the last week we have started getting complaints about missing ...
2
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420 views

When does Postfix not perform lookups in virtual_alias_maps?

I'm having a real pickle of a problem: I have a Postfix 2.6.6 / CentOS 6 server that's set up to forward mail from specific aliases to specific destinations. This is done through a mysql ...
2
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204 views

How to identify the user/computer that is relaying spam through a mail server?

For the past couple of days, at certain intervals, a huge load of email is dumped on my Exchange 2003 server and relayed out until it gets blacklisted everywhere. Nothing like this happened for many ...
2
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29 views

I need to set-up the blocked machine to relay to the unblocked machine using a different port

I have two Windows Server 2003 machines sitting in a network. Server B has port 25 open and can relay emails to the local network's smtp server. Server A does not have port 25 open. How can I set it ...
2
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261 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 ...
2
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204 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

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 ...
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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 ...
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47 views

SMTP delay when sending mail from Centos

I am encountering long delays when trying to send mail with swiftmailer using 1and1's SMTP server. there is a 19 second delay everytime as shown below by tcpdump: 21:54:50.784747 IP (tos 0x0, ttl 64, ...
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132 views

PHP mail() function - “from” name overwritten by Exchange Server

I originally posted this on stack overflow but was told it might be better placed here on Serverfault. I am trying to send a very simple email from a php script ...
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77 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 ...
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280 views

vCenter Server Appliance email's not reaching smtp server

Email's being generated from my test alarms in vCenter are not being forwarded to the proxy / SMTP server configured. I run tail -f on the mail log file when generating a test alarm and I can see the ...
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136 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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466 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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1k 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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399 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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5k 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 ...
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152 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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0answers
21 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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284 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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2k views

How to access Apache Tomcat running on Windows Server 2012 (alongside Microsoft SMTP service)

I am running Apache Tomcat as my only HTTP server on Windows Server 2012. Tomcat has been installed as a service and is bound to port 80. The server.xml file has had address="0.0.0.0" added to the ...
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243 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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294 views

Mail stuck in queue folder using IIS 6.0 SMTP server

I have finished setting up my server but when I sent email it got stuck in queue folder. This was a test email which I put in pickup folder. So I checked my log file. I have pasted the log files ...
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1k views

451 Timeout trying to verify RCPT errors from some external contacts

Outside contacts at two companies report messages they sent to us return with the following message: 451 Timeout trying to verify RCPT validemail@ourdomain.com for domain One of the companies ...
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235 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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559 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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56 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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892 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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372 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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165 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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326 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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0answers
188 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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501 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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161 views

IIS 6.0 and Virtual SMTP relay ~ some messages are bouncing

I will give a quick overview and then the details. I have a Exchange 2003 environment that I have been asked to slap on a disclaimer on all outgoing mail. So I have setup a Windows 2003 server and ...
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338 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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68 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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0answers
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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327 views

Configure Exchange 2007 to Route Messages for Shared Address Space

I have a strange problem with Exchange 2007, the company has two separate offices, one with SBS 2008/Exchange 2007 installed, the other does not have a server and uses our pop3 service from our web ...
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0answers
568 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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673 views

Postfix sasl relay host - weird behaviour

Previously I had a relayhost set in postfix to mailhost.zen.co.uk - I don't think it accepts SASL - only TLS. So I though I would try changing to a different relay host. However, the following log ...
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11 views

When using an “Internal Relay Domain” as an Accepted Domain, what email addresses must be synched?

There are a number of SMTP addresses associated with a user in Exchange SMTP, X500, X400, etc. In addition there is a LegacyDN. Some of these email addresses are stored in the NK2 files and also in ...
0
votes
0answers
49 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
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142 views

hMailServer SMTP installed in LAN, clients in LAN can send Email but clients from the Internet cannot

I had checked the troubleshooting guide and many posts here and could not find solution so far. I had setup a network in Azure Cloud with 2 VMs, 1 of which is domain controller and the other is Web ...
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24 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
66 views

IIS SMTP SmartHost configuration failing to send for a specific domain recipient

I have an web application sending email (pickup folder) using the local IIS6.0 SMTP server. It is configured to send email via Rackspace as a SmartHost. We have a problem sending emails to a ...
0
votes
0answers
180 views

cPanel/EXIM re-routing mails through Mandrill to circumvent Gmail rate-limit

I have two cPanel domain (lets assume abc.com and xyz.com) where we have 300+ mailboxes. Users email themselves and outside the company. Most of the emails sent outside the company are to GMAIL. ...
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162 views

AmazonSES + DKIM + Hotmail = temperror

Although SPF is passing, I'm getting a dkim=temperror on hotmail only (it's working on Yahoo and Gmail). I'm using AmazonSES, and already have the proper CNAMES for DKIM signing on my domain at ...