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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SPF blocking some emails. How to complete disable it?

We have configured a SMTP server on IIS. We have not configured any SPF rule. Some emails are going straight to the badmail folder. Most of them have this error message: Address does not pass the ...
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441 views

Nginx Server with Ruby on Rails application SMTP Authentication Error

I'm developing a Rails app which when I run it locally, it's able to send emails through a gmail account via smtp. When I moved it to my sever (running Nginx), it comes up with the following error ...
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562 views

SMTP Error “check for new mail first”

I need to send e mail from a asp.net web site. The mail server is not in same network with the web server (it's in different location). Sometime it sends the mail without any error, but sometimes it ...
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458 views

Sending mail from different IP for each domain

I have on one server domain1.com domain2.com domain3.com on CentOS and Qmail. I want them to send email trough a second server that uses ip1, ip2, ip3. I can easy do this by editing this Qmail file: ...
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457 views

UNIX SMTP client that supports MS Exchange proprietary (EXPS) authentication?

I'm trying to non-interactively send emails from Solaris through an Exchange 2007 server, but the Exchange server only allows Exchange Server authentication (OWA access is also disabled). Here's the ...
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448 views

How to parse e-mail bounce notifications

What options do I have to parse the e-mails that have bounced? I am receiving the bounce notification from e-mail servers but don't know what to do with it. Thanks Edit: I just want to know how to ...
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4k views

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 ...
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384 views

PTR Record Troubles

I am having a hell of a time getting our PTR record right. Our current PTR zone looks like this: $ttl 38400 @ IN SOA ns1.domain.com. admin.domain.com. ( 1268669139 10800 ...
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340 views

Email flow problem in Exchange 2003

I have a problem whit some emails that are not being delivered to the user inbox. The SMTP server on the DMZ that receives email from the internet is a Symantec Brigthmail Gateway, this server reports ...
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741 views

iis 7 caching PDF files causing wrong attachments to be sent

I've got a weird problem with my web server. I have a page that creates a PDF file and a button to send that same file as an attachment in an email. So I hit create, then press send, create, then ...
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267 views

How to limit SMTP delivery to hourly batches

Moved over from StackOverflow. Sorry if you saw it there first In an effort to keep us from being labeled spammers by major ISPs (in addition to SPF records, privacy policies, CANSPAM compliance and ...
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422 views

IIS SMTP Configure Delivery Status Notification Content

how can I configure IIS SMTP sever to not attach the original mail to the Delivery Status Notification messages? The problem is that when sending newsletters with fairly large attchemnts all these ...
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504 views

Windows 2003 SMTP virtual server, why emails are not delivered?

Configured Windows 2003 as my email client, everything works fine with POP3 (i'm able to recieve emails), the problem is with SMTP and i can't figure out how to find where excatly this problem is, ...
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472 views

How to force internal email through an smtp connector in exchange 2007

I have reason to force internal messages through an smtp connector. Can this be done?
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622 views

I want Lotus Domino to only send one email to users that are both recipients and members of a cc'ed lotus group

Lotus Domino 7 and now Lotus Domino 8.5 The scenario: A@mycompany writes an email to b@internet and cc's it to group@mycompany. A@mycompany is a member of group@mycompany. With the initial email ...
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438 views

SMTP Verb Error on MSExchange Server 2003

Every morning for the last two weeks or more I've had to reboot our Exchange Server and often I have to reboot it again during the day. We use a smarthost for sending our mail out and if I view the ...
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47 views

Exchange SMTP authentication issue with spammers

I have a single Exchange 2013 server with all the roles and it looks like it's being used by a botnet. It is sending mails every 10 minutes to a specific domain from a specific user. It is not an ...
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26 views

Iptables SMTP re-routing on a proxy

I'm lost... Any help would be appreciated :) I have a mailserver. Unfortunately, the provider deny the smtp 25. I don't want to use ESMTP or a vpn. So here is the project : I have a dedicated server ...
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21 views

How to make exim4 on Debian safe?

I am running exim4 on a vanilla Debian Stable system. The machine has proper DNS A and MX records. I want to use it as a mail server. SMTP with TLS already works fine for authenticated users. ...
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20 views

sending e-mails via sendmail using virtual-users

Currently my sendmail send e-mail with following header: Received: (from www-data@localhost) I want this header to be like: Received: (from contact@mydomain) but I am also hosting multiple ...
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51 views

Exchange 2010 not receiving some emails

Exchange 2010 not receiving emails from some senders. They receive the following email rejection message: Diagnostic information for administrators: Generating server: mail.domain.com.au ...
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113 views

Sendmail's MTA, MDA and SMTP 550 User Unknown forwarded to postmaster

I have two boxes running sendmail and configured as: MTA accepting connections from the outside world (mta.xyz.com) MDA accepting connections from internal network and storing them in user mailboxes ...
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168 views

Exim4 require TLS for all hosts but localhost

As my webmailer does not support STARTTLS and I want to enable relaying for everyone at localhost, I would like to have Exim advertise AUTH PLAIN and LOGIN only without TLS if the connection was ...
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130 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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29 views

monitoring availability of publicly accessible distribution lists

I have an unusual request from management: to set up monitoring of public-facing email addresses that resolve to distribution lists(groups). We are using Exchange 2010 to host these lists/groups. I ...
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316 views

EXIM - 550 Cannot receive from specified address - Sendgrid

We're having some intermediate issues with exim where some emails go through and then others get the 550 Cannot receive from specified address Error. This is the guide we used to setup EXIM: ...
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952 views

RoundCube SSL SMTP Failure

I've set up a roundcube installation on my website that works great when using SSL for IMAP and non-ssl for smtp. The only problem is this: when I switch to using ssl://smtp.[mydomain].com for my ...
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245 views

Incoming hotmail connections timing out with TLS enabled

Okay, this has me completely baffled. I have tried many things to fix this but I'm at my wits end. At the start of June, the server which I maintain suddenly decided to stop accepting incoming TLS ...
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53 views

Exchange 2007 issue internet receive connector

I have issue with yahoo.co.uk if I send a mail from within the yahoo webconsole the mail arrives in my inbox on the exchange server If I send mail from Iphone configure to send via mail box ...
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38 views

What is the maximum message size that SendMail can successfully receive and where would the bottlenecks be?

CentOS 5.x | SendMail 8.14 I'm curious - what is the largest message size that SendMail will successfully accept from an upstream source via SMTP? The tweaking config options page indicates that by ...
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561 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 ...
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277 views

Using IIS smtp for incoming and outgoing and use hMailserver for mail accounts

I have installed hMailServer in one machine and IIS STMP in another machine. Even though hMailSever itself is a SMTP server. I can't avoid this because the IIS SMTP server has some hooks which which ...
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196 views

change ehlo name of Amavis

Server: Ubuntu 12.04 64 bit Setup Postfix + Dovecot + Amavis with Mysql for Virtual domains. I have configured the postfix mailserver successfully. However when I test the Email with mail-tester.com, ...
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214 views

Postfix mail from outside not received

I am using Dovecot with Postfix and virtual user/mailboxes. Everything works fine accepting receiving mail from outside (other domains named as the mailserver) I am able to: - send mail from my mail ...
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430 views

Postfix: can't send mail from remote client

I'm having issues sending mail from postfix. I believe my conf. is very standard, at the end it was put together from various guides. I'm trying to send mail from remote client (iOS Mail, and Mac OS X ...
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351 views

Email server fails to authenticate my client, returns “use web to login”

I'm trying to send a mail message using System.Net.Mail.SmtpClient via Yandex Mail and have the following transcript: S: 220 smtp17.mail.yandex.net ESMTP (Want to use Yandex.Mail for your domain? ...
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241 views

SMTP routing with EDGE servers for Exchange 2010

I am trying to set up some EDGE servers for Exchange 2010 (SP3 UR2) but they are being a real pain. I have the following servers in my environment: CASHT1 – CAS array member – FQDN is ...
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380 views

Cannot connect to remote port 465

I (actually, not me, rather a friend of mine) have a very strange issue. There's a VPS with CentOS, probably version 5: Linux [hostname] 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:43:28 EDT 2011 i686 ...
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132 views

IIS SMTP Server as MTA

I have domain xyz.com. I'm sending mail using MTA. through Symantec Cloud. My setup is as follows. [Symantec Cloud]<->[MTA]<->[Local Mail domain] all the mail out side the domain(xyz.com) goes ...
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603 views

Configuring external SMTP server on Azure VM - messages staying in queue

I have an external SMTP provider: auth.smtp.1and1.co.uk I am trying to send SQL Server Reporting Services emails via this on an Windows 2012 Azure VM. It is configured sufficiently correctly for ...
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331 views

'Cannot get iis pickup directory' in Windows Server 2012

Our system moved from Windows Server 2003(Enterprise SP2) & IIS 6. And new system is Windows Server 2012(Standard) and IIS 6(for smtp mail) & 8. I copied all of web application files and IIS ...
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634 views

Exchange 2010 delivery to postmaster 550 5.1.1 User unknown

Exchange 2010 has a distribution group setup called postmaster and the Email addresses associated with it are postmaster@example.com, postmaster@example.net etc Internal emails sent to postmaster ...
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70 views

Spamming from Exchange 2003

I am apparently spamming the world (about 1000 a day) but cannot figure out how. Mxtoolbox does not list me as an open relay and I have disabled all relays that I can find. I have run every virus ...
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342 views

Telnet to new SMTP server port 25 times out

I just got Postfix 2.9.6 up and running on a Debian 7 Wheezy server and I can send and receive mail to the outside world but I'm unable to login to the SMTP server. I've tried telnet, first by ...
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334 views

Interspire Email Marketer taking long time to send bulk emails

I am using Mailjet SMTP Server along with Interspire Email Marketer to send emails to a large group of users (around 54,000). I once used Mailjet's inbuilt Email Marketer to perform a similar ...
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1answer
91 views

iSeries Apache SMTP error

I'm trying to send mail using either the built-in PHP mail() function or through the phpmailer library, which of course relies on mail(). phpmailer says it "cannot instantiate the mail function" so ...
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75 views

SMTP on IIS 7.5 spam?

I have some problem with SMTP server, maybe, with some robot, malware? Log looks like this: 2013-07-15 19:52:52 127.0.0.1 kasandra SMTPSVC1 KASANDRA 127.0.0.1 0 QUIT - kasandra 240 100044 133 3335 ...
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332 views

Have Exchange/Outlook process html tags in SMTP mail

I am working with a third party application that sends simple SMTP email messages. The application doesn't respect line breaks or multiple spaces so the resulting email is barely legible. Since the ...
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639 views

Windows SMTP Service - Configure Smarthost for Specific Domains over different ports

I have a client that was recently acquired by a company. Their email system now resides on the parent company's network. Currently there is no VPN setup between my client and the parent company. I ...
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79 views

Exchange 2003 smtp collector delivery restriction

In a Exchange 2003 the SMTP collector has the 'Delivery Restriction' configurated to deny for all except for who is in a security group mail-enabled (called 'InternetMail'). There are user ...