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.

learn more… | top users | synonyms

0
votes
1answer
7 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 ...
0
votes
1answer
21 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 ...
0
votes
1answer
36 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
votes
1answer
1k 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 ...
0
votes
3answers
7k views

SMTP don't work when try to send mail from mail clinet

Mail server works fine when send mail from server, but when I use some mail client it not work. I found this in logs: Jul 12 19:45:04 tvsite postfix/smtpd[3356]: warning: hostname adsl-bb29-l44 does ...
0
votes
1answer
18 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 ...
2
votes
1answer
5k 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 ...
-1
votes
0answers
13 views

Recommended setup for F5 with multiple EXIM servers behind

I have following setup: 4 EXIM 4.80.1 servers. All mail relay clients are redhat linux , I use mailx command for testing relay from clients specified in "hostlist" on exim.conf Have valid cert ...
0
votes
1answer
46 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 ...
2
votes
2answers
1k views

Sent items via Exchange SMTP stored in the users mailbox

Using Exchange 2010 server, is there a way to store outgoing emails in the mailbox's sent items folder when an SMTP authenticated user is sending an email via the exchange server's SMTP server? (I.e ...
0
votes
1answer
3k views

Bounce message from gsmtp - weird message path

please consider the following email headers from a message that was returned to the original sender. The multipart bounce message also contains the transcript (clear text + HTML) of the correspondence ...
1
vote
2answers
5k views

SMTP mails being rejected by receiver

I run a custom webshop where my system sends out different notifications. Unfortunately yesterday I started receiving a lot of rejected emails. It's not all emails being rejected, only a specific ...
5
votes
1answer
85 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 ...
1
vote
2answers
946 views

Rate limit exim per user basis

How can I implement "rate limit" in Exim so that every user in my exim can send specific number of emails per day. List A of Users can send 100 emails per day and the list B of users can send 500 ...
0
votes
1answer
1k 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 ...
0
votes
3answers
999 views

Domino always server fails to send SMTP email at first attempt

In our logs, we find the below: Router: No messages transferred to fakedomain.com (host mx.fakedomain.com) via SMTP: The server is not responding. The server may be down or you may be experiencing ...
0
votes
1answer
24 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
32 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 ...
2
votes
3answers
6k views

Cisco ASA rewriting SMTP traffic to prevent mail sending

We have a Cisco ASA 5505 (version 8.0(4)) that is preventing outbound SMTP traffic; testing with telnet shows connections on port 25 are having everything converted to *s while the same does not ...
0
votes
1answer
28 views

Windows Server 2008 IIS6 SMTP With more than 1 FQDN

I've tried researching this one, but I'm not having much luck on google. What I have is a Windows Server 08 R2 with IIS6 SMTP installed and configured / working 100% perfectly for Domain A. Domain ...
9
votes
10answers
47k views

IIS/SMTP - emails are stuck in mailroot/Queue

I'm trying to send e-mails via SMTP within the IIS pickup directory. Unfortunately the e-mails are just going into the mailroot/queue folder and stay there. They never actually get sent. Does ...
-2
votes
1answer
13 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 ...
0
votes
1answer
430 views

RAID Card Event Notifications Email to Gmail

I need to get email for event notifications from our RocketRaid 2782. The problem is I don't see a way to get it to send mail to our google apps gmail account. I don't think the card offers ...
5
votes
3answers
13k views

Exchange Connector Won't Send to External Domains

I'm a developer trying to get my .Net application to send emails out through our Exchange server. I'm not an Exchange expert so I'll qualify that up front!! We've set up a receive Connector in ...
-1
votes
1answer
14 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 ...
5
votes
2answers
221 views

What is the difference between 3-digit and dotted SMTP error codes?

When looking up SMTP error codes, I sometimes see "550", or "5.5.0". And sometimes the number in the dotted code is different. I found the numeric codes defined in RFC 821 and the dotted codes in RFC ...
0
votes
1answer
35 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 ...
1
vote
1answer
4k views

Exchange 2010 SP3: 4.3.1 Insufficient system resources

We have Office 365 with a hybrid deployment. Our on-premise server is relaying email directly out to the web (not via EOP). domain-a.com is an accepted domain on our on-premise server; domain-b.com is ...
0
votes
0answers
19 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 ...
-1
votes
1answer
31 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
votes
0answers
27 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 ...
5
votes
5answers
13k views

Easiest way to send a test email from a server, to test settings?

Using Windows (2008) is there an easy command line tool that I can use to send a test email from a server to test the SMTP, user authentication, ports, etc... without writing my own?
0
votes
1answer
982 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 ...
2
votes
1answer
4k views

monit send email does not work

I am trying to use monit, and set up email server using gmail. The configuration file is like this: set mailserver smtp.gmail.com port 587 username "someuser@gmail.com" password "password" using ...
1
vote
1answer
35 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 ...
0
votes
2answers
391 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, ...
0
votes
1answer
29 views

SMTP-Mailing with PHP works - but not with PHP-Cli

I mentioned a strange behavior on my webpage: If I try to use Joomla to send Mails via SMTP it works fine; no problem at all. But: If I try to use a PHP-CLI-Script the action fails (same source ...
0
votes
0answers
88 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 ...
3
votes
2answers
92 views

Is setting up my own SMTP server to send email a waste of time with regards to deliverability?

I have a dedicated host serving a few domains I manage. I host my own email and IMAP server. The server is at buildoneforme.com with IP address 144.76.81.247. I think reverse DNS is working: $ host ...
2
votes
2answers
27 views

Where do these “single-dot” smtp connection failures come from?

I'm running a mailserver based on postfix. There are a lot of connection failures like this: Transcript of session follows. Out: 220 hostname.tld ESMTP Postfix In: . Out: 502 5.5.2 Error: command ...
0
votes
1answer
1k views

Windows Server 2012 R2 IIS SMTP Server Will Not Send Emails

I have an existing SMTP server on our network that is used to send emails from a variety of printers, applications, etc... I have installed the IIS SMTP Server on a new Windows Server 2012 R2 server ...
1
vote
1answer
15 views

Mailman not integrating with postfix properly

I installed postfix on my local machine and able to send mails to local users i.e. shivams in my case which is username of the account. Also i am able to send mail outside of my machine for ex. ...
0
votes
1answer
48 views

Google Apps with internally/customer hosted SMTP relay - (not using smtp-relay.gmail.com service)

We are using Google Apps for our email service, and send a bulk of around 15k emails a day from our internal relay server (its outbound only, no open-relay) to customers. Recently, we ended up ...
1
vote
1answer
24 views

Outbound emails not being signed with DKIM using Postfix on Centos

I have been using phpmailer for my emails and i had dkim working correctly with this. I have a key mail._domainkey.domain.com. I have validated my past emails with http://www.mail-tester.com/ and i ...
2
votes
2answers
2k views

reason: 403 4.7.0 TLS handshake failed

Sending email to one particular domain, I get the following error: ----- The following addresses had permanent fatal errors ----- <> (reason: 403 4.7.0 TLS handshake failed.) ----- ...
1
vote
1answer
31 views

Postfix: Set custom SMTP Banner based on address used to access server

The Postfix parameter smtpd_banner sets the text of a server's SMTP greeting banner. The default setting is: smtpd_banner = $myhostname ESMTP $mail_name My mail server has several unique IP ...
0
votes
1answer
33 views

What directory permissions does Postfix require to copy mail into a users maildir folder?

I have postfix setup and running. Everything seems good other than the directory permission errors. In the past i accidentally ran chown -R apache / which as you can imagine broke a crazy amount of ...
-1
votes
0answers
33 views

Postfix won't authenticate through SMTP but SASL does

I've been struggling to setup a Postfix on my server and I think I'm so close. So far I managed to get a success out of testsaslauthd like this: # testsaslauthd -s smtp -u mehran@example.com -p 123 ...
0
votes
1answer
37 views

Show blocked SMTP connections in Exchange 2010

Currently, I have an anonymous receive connector set up on my Exchange 2010 system that allows from an entire subnet. I'm looking to change this to only allow from specific IPs, but need to know when ...
2
votes
2answers
3k views

host said: 550 IP is not allowed to send mail from gmx.de (in reply to RCPT TO command)

This message was received by a mailing list maintainer, that one of our customers subscribed to: host mailx.paritaet-bremen.de said: 550 213.30.233.146 is not allowed to send mail from gmx.de (in ...