dusko + mailserver + sysadmin   96

SMTP Gateway - Free SMTP Gateway - XEAMS - eXtended Email And Messaging Server
Pricing for SMTP Gateway
There is no charge for the software. It is free for both commercial as well as non-commercial use.

SMTP Gateway is a free SMTP server that can be used either as a backup server to your primary email server to provide load balancing. Its built-in queue holds messages until the primary server comes up. Hence providing an uninterrupted e-mail infrastructure for any company. SMTP Gateway provides a web-based administration allowing users to modify configuration and monitor its status remotely from any machine.
mailserver  mta  backup  sysadmin 
4 days ago by dusko
[CentOS] Re: How to size an email server to handle 5 million emails per day
On Thu, Jan 03, 2008, Joshua Gimer wrote:
>I can only talk from experience; we are currently doing spam and anti-virus checks in our inbound flow of around 600,000 messages per day.
>To do this we have three inbound SMTP gateways running Sophos Puremessage with Sendmail as the MTA. These systems are quad proc systems with 6 to 8 GB of ram. This is still not enough to handle the inbound flow efficiently at our organization.
sendmail  mta  smtp  sysadmin  mailserver 
5 weeks ago by dusko
Sendmail - NST Wiki
How To Flush Out All Email Messages From The Sendmail Queue

Sometimes email messages can be queued up with the Mail Transport Agent: "sendmail". The following command line can be used to manually try to immediately flush out All emails queued up by "sendmail". Even though a "sendmail" service may be running, this command is Ok to use, it will only run once and then terminate.
Try To Flush Out The Entire "sendmail" Queue:
[root@probe-222 root]# /usr/local/sbin/sendmail -q -v
sendmail  mailserver  sysadmin 
12 weeks ago by dusko
Sendmail Evolution
Gregory Neil Shapiro and Eric Allman
sendmail  mailserver  sysadmin 
12 weeks ago by dusko
example_mail Cookbook
A Chef cookbook to setup a proper mail server for production usage.
Sources for this Cookbook



Mad props to those two links above. Thanks the documentation of these two guys, most of this configuration was possible and is indeed shamelessly copied from their links above.
mailserver  sysadmin  devops 
12 weeks ago by dusko
Sendmail Delay?
By default sendmail sends out a queue runner every 5 minutes. The default Timeout.hoststatus is 30 minutes, which means if a timeout occurs attempting a delivery (a temporary failure) that host will be ignored for 30 minutes, even though queue runners are being sent every 5 minutes. You might try playing with the Timeout.hoststatus settings - confTO_HOSTSTATUS in sendmail.mc and send out a couple of queue runners to see if you can clear the queue more quickly.
sendmail  mailserver  mta  sysadmin 
july 2018 by dusko
MJML - The only framework that makes responsive-email easy
MJML - The only framework that makes responsive-email easy. Framework to create amazing emails.

Drop in Components
- lists
- carousel image slider
- social share buttons
- invoice
- Tables
- Location
- Buttons
- Navbar
- Hero heading

GitHub - https://github.com/mjmlio/mjml
Project - https://mjml.io/
Docs - https://mjml.io/documentation
Examples - https://mjml.io/templates
Generator - https://mjml.io/try-it-live
Image - https://www.apollowebstudio.com/screenshots/2017/mjml-email-template-framework.jpg
mailserver  email  sysadmin 
april 2018 by dusko
Symbiosis - An easy-to-use hosting environment developed
What is Symbiosis?
Symbiosis is an easy-to-use hosting environment developed at by the team at Bytemark. The design goals were to invent a way of managing a server that was easy to use, but integrated well with Debian GNU/Linux.

We recognised the need to balance the need for ease of use with running cutting-edge websites, and reliable email handling.
mailserver  sysadmin 
march 2018 by dusko
The beginning of the end of the private mail server
Thanks to overzealous filtering by mail relays, the small mail server is becoming an endangered species. ---- Posted on Dec 8, 2014.
mailserver  sysadmin  smtp  spf 
march 2018 by dusko
Complex Sendmail Structure
PROBLEM: Convert mail from PMDF to sendmail.
Current environment is a single mail server, running PMDF, with /var/spool/mail NFS mounted on >40 machines.
This must be replaced with a sendmail environment, with two servers, no NFS.

In order to convert the handling of email from PMDF to sendmail, and to completely reconfigure the mail environment, several dependencies had to be met. They were:

1) All Mail leaving the company must have usernames rewritten to first.last
2) All mail bound internally must have the sender address remain uname@company.com, but the recipient must be rewritten to first.last@company.com.
3) There must be two mail machines. One machine must handle all rewrites, aliasing, and Majordomo lists. The second machine must house the mail spool, and otherwise be ignorant of any rewrites. They will be referred to as “sender” and “reader”
4) NFS mounting the spool is not an option.
5) Using fetchmail is not an option.
6) Using only one machine to accomplish both tasks is not an option.
7) Any/all databases must be maintained automatically, rebuilding every 10 minutes.
8) Inbound mail to first.last must be delivered, but reader cannot have an aliases file.
9) Mail cannot be sent locally on reader, but must first go to sender to have addresses rewritten.
10) All Majordomo aliases, and the program itself must live on sender.
11) Special exception aliases must work correctly, even if they are amalgams of the first.last pair.
sendmail  mailserver  sysadmin 
march 2018 by dusko
mail-tester.com -- newsletters spam test
Check your newsletter's spam score and quality. This tool's free, and pretty.
mail  sysadmin  mailserver  smtp  email 
january 2018 by dusko
logwatch -- what's a -bs?
> what's a -bs?

A sendmail commandline parameter used by programs like pine to send mail. If the sender is not a trusted user this warning is written to the logs.
smtp  log  mailserver  server  sysadmin  sendmail 
december 2017 by dusko
Mbox to Maildir conversion (forked from version on dovecot.org)

Updated to add a '-v' option that will strip a directory extension (much like '-r' would strip an mbox extension.
email  mailserver  sysadmin  perl 
december 2017 by dusko
Postmaster info - AOL
Information on methods and support for issues concerning mail
mailserver  sysadmin 
august 2017 by dusko
Your Idea to Fighting Spam Will Not Work
Your post advocates a

( ) technical ( ) legislative ( ) market-based ( ) vigilante

approach to fighting spam. Your idea will not work. Here is why it won't work. (One or more of the following may apply to your particular idea, and it may have other flaws which used to vary from state to state before a bad federal law was passed.)
spam  sysadmin  mailserver  email  devops 
december 2016 by dusko
E-mail move today
key word "move", not migration. Some of these people have had the same e-mail for 10+ years, no restrictions or anything. Switching to corporate's e-mail with all kinds of restrictions, including email retention rates. -- What sort of fun are you guys having today? ---- We did that 7 years ago. It was a fucking month of a trail of tears and sob stories about lost emails, then another solid two years of complaints about the retention policies. -- Stock up on booze. -- Today, and the next two weeks are "read only" for us. We're about to open a big new branch office mid-June, and this week is the calm before the storm. My people have been instructed that changes result in termination AND crucifixions, our job is just to get the helpdesk queue to zero and keep it there. --- Posted on Mar 23, 2016.
sysadmin  mail  mailserver  email 
may 2016 by dusko
Get Help Upgrading Zimbra Collaboration, free online training course
Need help upgrading Zimbra Collaboration 7.x to the latest release? Watch this free online training course (http://info.zimbra.com/how-to-upgrade-to-zimbra-collaboration-8-training-video) and learn about: * New features for IT such as rolling upgrades and auto provisioning, * User enhancements including new clients and accessibility support for mail, * How to upgrade Zimbra Collaboration using a rolling upgrade process, * Other upgrade methods including Rsync and full migration. ==== Watch the on-demand training video now (http://info.zimbra.com/how-to-upgrade-to-zimbra-collaboration-8-training-video) for help upgrading from Zimbra Collaboration 7.x to Zimbra Collaboration 8.x. ==== Posted on May 19, 2015.
mail  sysadmin  zimbra  mailserver  smtp  email 
november 2015 by dusko
Debian Mail Server - Part 2: SPF and DKIM
TL;DR: check mail-tester.com (https://www.mail-tester.com/). If you don't get 10/10, read this post.
mailserver  smtp  email  sysadmin 
november 2015 by dusko
Listing Distribution List Members - Zimbra
We have been using the distribution lists feature via the Admin UI for a while now, and we keep finding more and more uses for them. The only problem that we have come across (caused by us) is that we need to periodically audit the members of each distribution list. We do this to make sure that all required users are on each list, and that no one is on a list that they shouldn't be. ==== I did not see anything already available that did this so I put together a real basic LDAP query to accomplish this task. I figured that if I needed to do this someone else would also, so here is the basic query to list the members of all distribution lists.
LDAP  mail  sysadmin  zimbra  mailserver  email 
october 2015 by dusko
Mailboxes by Distribution List - Zimbra
One of our domains has about 100 distribution lists for each of their departments/offices, and requested a way to get a breakdown of all of their users, and which distribution lists they were in. ---- I saved this file in /opt/zimbra/backup/scripts/ as userbreakdown.sh, owned by zimbra.zimbra chmod 755 userbreakdown.sh
mail  sysadmin  zimbra  mailserver  email 
october 2015 by dusko
Announcement: Zimbra Higher-Ed Admins mailing list
For those of you who manage Zimbra for a post-secondary institution, you know there are 'special' challenges associated with running such a sophisticated piece of software on such a large scale. ==== Last month, I launched a mailing list allowing us to discuss such challenges and share our solutions. Now that Zimbra has an Edu forum, I have a place to announce it here as well. ==== Discussion could range from hardware architecture, to user documentation, to collaborating on Zimlets (I hope :) ), and everything in between. ==== To subscribe, send a message to zimbra-hied-admins-request@sfu.ca with the word "subscribe" in the Subject line. There's an archive of postings to date (pretty light so far) here: zimbra-hied-admins list (http://www.sfu.ca/~hillman/zimbra-hied-admins) by thread ==== Thanks! - Steve Hillman - IT Architect - Simon Fraser University ==== Posted: Apr 14, 2008.
mail  sysadmin  zimbra  mailserver  email 
august 2015 by dusko
Script for Export-Import Zimbra Mail Server Accounts and Passwords
Script for Export-Import Zimbra Mail Server Accounts and Passwords
mail  sysadmin  zimbra  mailserver  email 
august 2015 by dusko
SSL Cert requests should use SHA 256 signatures - Zimbra 8.5 - New Features ZCS 8.5
## SSL Cert requests should use SHA 256 signatures ##


To enhance security, the default signature of cert requests is now 256 bits.
mail  sysadmin  zimbra  mailserver  email 
june 2015 by dusko
Zimbra 8.5 - New Features ZCS 8.5
Bringing to notice some notable new features and functionality released with ZCS 8.5.
mail  sysadmin  zimbra  mailserver  email 
june 2015 by dusko
Zimbra: Activar HTTP Strict Transport Layer y conseguir el A+ en el test de SSL Labs
Zimbra: Enable HTTP Strict Transport Layer and get the A + on the test of SSL Labs --- Posted: Jun 18, 2015.
mail  sysadmin  zimbra  mailserver  email 
june 2015 by dusko
Zimbra: Enable HTTP Strict Transport Layer and get the A + on the test of SSL Labs (Google Translate)
Zimbra: Enable HTTP Strict Transport Layer and get the A + on the test of SSL Labs --- Posted: Jun 18, 2015.
mail  sysadmin  zimbra  mailserver  email 
june 2015 by dusko
Best Practices for Preventing You from Looking like a Spammer
Best practices for preventing you from looking like a spammer.
mail  sysadmin  smtp  mailserver  email 
june 2015 by dusko
Simple Mail Transfer Protocol
This chapter describes the Simple Mail Transfer Protocol (SMTP). It includes these sections:

* Introducing SMTP
A brief description of the SMTP, including definitions of terms used in this chapter to describe SMTP.

* Using the Mail Facilities
Describes how to use the Cisco IOS for S/390 mail facilities for the transportation of electronic mail.

* Interface to a User Mail System
Describes the interfaces between the Cisco IOS for S/390 mail routines and the post office.
mail  sysadmin  smtp  mailserver  email 
june 2015 by dusko
SMTP Commands
This page gives a quick summary of the major commands and command sequence used by the SMTP Protocol to transfer email. In Unix, the "sendmail" program listens for connections on port 25, and the SMTP protocol is a plain text conversation. This means that it is possible to telnet to port 25 on a system and manually enter SMTP commands. This is useful for two things, manually testing a sendmail configuration, and forging email. --- One unfortunate, but at times entertaining feature of sendmail is that it is trivial to generate forged email for older sendmail configurations. Newer sendmail features make it possible to perform some sanity checking on the sender of email. You can make sure that at least the sending machine is who they say they are via reverse DNS queries. But there is nothing to prevent the SOA DNS server for an address range from providing bogus reverse name information. The additional step of doing a second IP address look up to verify that the IP address returned in a name to IP lookup matches the IP address that made the connection in the first place. See the security (http://the-welters.com/professional/smtp.html#security) section below for more information.
mail  sysadmin  smtp  mailserver  email 
june 2015 by dusko
MailRadar - Email Oriented Community for Linux Sysadmins
As a Linux oriented community for sysadmins, MailRadar.com aims to provide unique information and surveys about email messaging and email servers, as well as a range of free tools to help you determine the status of an IP or domain, or the security level of your mail server.
mail  sysadmin  smtp  imap  mailserver  email 
june 2015 by dusko
Proper SSL Certificates for Postfix and Dovecot
So far you will have received warning on the SSL certificates you use for Postfix, Dovecot and the RoundCube email web interface. SSL/TLS is a great way to automatically encrypt the passwords between the email user and your mail server. So you want to have proper certificates. There are three ways you can handle your certificate:
mail  sysadmin  smtp  mailserver  email  imap  ssl 
june 2015 by dusko
Sample SMTP Session using the "netcat" (nc) Command
The "nc" (netcat) TCP/IP "Swiss Army Knife" program is a "pure" way to connect your keyboard with a remote TCP/IP daemon. It is similar to "telnet", except it doesn't try to auto-negotiate any line parameters first. It is useful for connecting directly to many text-based Internet protocols. Use "nc" in preference to "telnet", when available. --- One such text-based protocol is the Simple Mail Transfer Protocol (SMTP) used to send EMail over the Internet. This protocol is only used for *sending* email, not for receiving email. It is documented in RFC2821:
mail  sysadmin  smtp  mailserver  email 
june 2015 by dusko
FAQ - A Nice Collection of Questions and Answers about Mail Servers, IMAP and MX
Tuffmail - Professional Email Hosting for Business and Individuals
sysadmin  mailserver  email  dns  imap 
may 2015 by dusko
Setting up the Correct DNS Records for your Web or Mail Server
Problem: Simply purchasing a domain name is not enough to get email flowing in your direction, and people onto your website. you also need your DNS (http://www.petenetlive.com/KB/Article/TechTerms.html#DNS) Records to point to your IP (http://www.petenetlive.com/KB/Article/TechTerms.html#IP) address(s) as well. --- You will need to send this request to your ISP (or whoever is hosting your public DNS records). --- This runs through what information you should request and why. --- Remember if you have a security device on the outside of your network (like a firewall or a router providing firewall services) the correct ports will need to be open to your web server (usually TCP (http://www.petenetlive.com/KB/Article/TechTerms.html#TCP) Port 80 and/or 443), or your mail server (TCP Port 25, though Exchange may require 443 for OWA (http://www.petenetlive.com/KB/Article/TechTerms.html#OWA) and ActiveSync). --- Note: Note: This assumes your ISP (http://www.petenetlive.com/KB/Article/TechTerms.html#ISP) has given you either a static public IP address, or a range of public IP addresses. It is possible to use services like no-ip (http://www.no-ip.com/) if you don't have a static IP address.

* DNS Records - Mail Server Requirements (http://www.petenetlive.com/KB/Article/0000567.htm#SMTP)

* DNS Records - Web server Requirements (http://www.petenetlive.com/KB/Article/0000567.htm#HTTP)

- Posted on: Aug 2, 2012.
mail  sysadmin  mailserver  email 
may 2015 by dusko
Message Threading
In this document, I describe what is, in my humble but correct opinion, the best known algorithm for threading messages (that is, grouping messages together in parent/child relationships based on which messages are replies to which others.) This is the threading algorithm that was used in Netscape Mail and News 2.0 and 3.0, and in Grendel. --- By: Jamie Zawinski (c) 1997-2002.
mail  sysadmin  mailserver  email 
april 2015 by dusko
Putsmail - Test your HTML emails before sending them
Test your HTML emails before sending them. --- A standalone, free tool for email designers to perform quick tests of their campaigns.
mail  sysadmin  email  mailserver 
march 2015 by dusko
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