Diagnostics

articles on how to diagnose SMTP issues

http://iserversupport.com/find-spammer-on-cpanel-exim-server/

iserversupport.com/find-spammer-on-cpanel-exim-server/

This is very important to you to know how you can Find Spammer on cPanel exim server. Just go through our post to get information about it.

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https://support.google.com/mail/answer/78775?hl=en

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:

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http://community.spiceworks.com/how_to/show/2974-how-to-determine-if-a-mail-server-is-tls-enabled

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.

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http://serverfault.com/questions/131627/how-to-inspect-remote-smtp-servers-tls-certificate

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 ...

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https://tools.verifyemailaddress.io/Articles/Ping/How_To_Ping_Email_Address/

tools.verifyemailaddress.io/Articles/Ping/How_To_Ping_Email_...

Pinging an email box is a way to see if an email address is valid or not. Learn how it's done.

This article gets into the technical meat of how to ping email boxes. It's target audience assumes a basic level of computer and networking understan ...

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https://technet.microsoft.com/en-us/library/aa995718%28v=exchg.65%29.aspx

technet.microsoft.com/en-us/library/aa995718%28v=exchg.65%29...

Telnet is an extremely useful tool for troubleshooting issues related to SMTP and mail flow. For example, you can use telnet to:

  • Verify that SMTP is installed properly, and that it has all the necessary commands.

  • < ...

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http://randombitsofuselessinformation.blogspot.co.uk/2008/03/investigating-ssl-smtp-configurations.html

randombitsofuselessinformation.blogspot.co.uk/2008/03/invest...

A basic set of instructions oh how to use telnet to diagnose SSL SMTP connections

 

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http://usertools.plus.net/tutorials/id/21

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 ...

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https://qmail.jms1.net/test-auth.shtml

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 ...

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https://support.sendgrid.com/hc/en-us/articles/200182038-Testing-your-connectivity-to-Sendgrid-s-SMTP-relay-using-Telnet

support.sendgrid.com/hc/en-us/articles/200182038-Testing-you...

Use these instructions to test the connection to your email server. The instructions are geared to SendGrid's servers but the method can be applied to any email Server.

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http://serverfault.com/questions/64411/whats-the-best-way-to-check-if-an-smtp-server-is-ssl-enabled-or-not

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.

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