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Various online tools
ipaddress.lv
My IP address?
MX, DNS, blacklist and SMTP diagnostics
All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information. And you'll have a chronological history of your results.
E-mail diagnostics
How Can I Ensure that Everybody Gets my Emails? You can't. But you can do a lot to improve your chances, like getting a perfect score on mail-tester.
DNS diagnstics
SSL diagnostics
Uptime monitoring
Everyone with a website knows that, things can sometimes go wrong. Sometimes it is with the code, the server or the network.... Uptime Robot is all about helping you to keep your websites up. It monitors your websites every 5 minutes and alerts you if your sites are down.
Check DKIM
Check a published DKIM Core Key & DKIM Core Key Record
whatismyipaddress.com blacklist-check
Apache check gzip compression
Free Online SEO Tools
E-mail privacy tester
Some email clients perform operations when reading an email which give away information about the reader, to the sender of the message. If you enter your email address into the form on my home page, this web app will send you a confirmation email to make sure you own the email address. In that email there will be another link. Click that link and you will be taken to a page where you can trigger test emails to be sent to you. Those test emails are specially crafted to use a variety of techniques, to attempt to send information back to this server when read. It will then display the results for you. ...