www.socketlabs.com/smtp-server-connection-diagnostics-tool/
Free SMTP Server Connection Diagnostics Tool enables you to connect to SMTP Servers and step through transactions with our without SSL.
www.arclab.com/en/amlc/list-of-smtp-and-pop3-servers-mailser...
This is a list of all the major email provider's email settings which also includes UK ISP settings.
www.arclab.com/en/amlc/
MailList Controller is an email newsletter software for sending personalized email marketing campaigns and newsletters to your contact lists.
This software has an extensive list of features.
en.wikipedia.org/wiki/STARTTLS
An article from wikipedia describing STRTTLS
stackoverflow.com/questions/5540374/starttls-vs-ssl-tls
Mailclients offer both settings, the STARTTLS and SSL/TLS. What is the difference between STARTTLS and SSL/TLS?
This thread gives an ecellent explanation of this subject.
www.limilabs.com/blog/ssl-vs-tls-vs-starttls-stls
There's often quite a confusion about the different terms: SSL, TLS, STARTTLS and STLS. SSL and TLS SSL and TLS are cryptographic protocols, both provide a
serverfault.com/questions/523804/is-starttls-more-safe-than-...
In Thunderbird (and I assume in many other clients, too) I have the option to choose between "SSL/TLS" and "STARTTLS".
As far as I understand it, "STARTTLS" means in simple words "encrypt if both ends support TLS, o ...
novosial.org/openssl/tls-name/index.html
This page outlines terminology problems with the Secure Sockets Layer (SSL) protocol, the Transport Layer Security (TLS) protocol, the term STARTTLS, and the Transmission Control Protocol (TCP) ports used for encrypted connections. Other information on ...
superuser.com/questions/620745/thunderbird-ssl-tls-vs-startt...
Following up this question on serverfault "Is STARTTLS more safe than TLS/SSL?" it came up that the question is rather a question about Thunderbird and not about the actual protocols. Also, if you Google about this topic you will find ...
luxsci.com/blog/smtp-tls-all-about-secure-email-delivery-ove...
TLS, Transport Layer Security, seamlessly ensures transport email encryption for email delivery over SMTP between supporting servers. This is an easy to read article explaining SMTP TLS.
www.fehcom.de/qmail/smtptls.html
An indepth tutorial on SMTP and TLS.
qmail.jms1.net/test-auth.shtml
When setting up a mail server, one of the things you should do before you "go live" is to test it- not only to make sure things which should work, do work, but to make sure things which shouldn't work, don't.
One of the things to test is whethe ...
support.google.com/mail/answer/78775?hl=en
There are a few common reasons why Gmail users may have trouble sending mail with Gmail's IMAP or POP feature. If you can't send mail, here's a troubleshooting checklist:
randombitsofuselessinformation.blogspot.co.uk/2008/03/invest...
A basic set of instructions oh how to use telnet to diagnose SSL SMTP connections
serverfault.com/questions/131627/how-to-inspect-remote-smtp-...
We have an Exchange 2007 server running on Windows Server 2008. Our client uses another vendor's mail server. Their security policies require us to use enforced TLS. This was working fine until recently.
Now, when Exchange tries to deliver mail ...
community.spiceworks.com/how_to/show/2974-how-to-determine-i...
Read the step-by-step instructions written by an IT pro in the how to: How to determine if a mail server is TLS enabled.
usertools.plus.net/tutorials/id/21
In this tutorial I will be explaining the use of Telnet for accessing your cgi webspace shell as well as using it as a very simple and useful diagnostic aid in determining if a server or service is responding to requests.
In the following secti ...
kb.worldsecuresystems.com/kb/configure-ssl-encryption-your-e...
With today's email clients, it's possible to use secure SSL connections for added security. Doing so ensures that if another person somehow has the ability to eavesdrop on your Internet connections, that person won't be able to view your password or th ...
serverfault.com/questions/64411/whats-the-best-way-to-check-...
What's the best way to check if an SMTP server is SSL-enabled or not?
Follow-up question: How do I make it SSL-enabled if it's not yet SSL-enabled.
A simple thread discussing these questions.
support.terranetwork.net/web/knowledgebase/169/Secure-Email-...
This article explains how to set up email over SSL. Email over SSL is an optional feature on our standard hosting packages; and a compulsory feature on our Secure (PCI compliant) hosting packages.
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