Some Notes on the Machines

Here is one:

http://www.appmaildev.com/en/dkim

A free tool:

https://www.dmarcanalyzer.com/dmarc/dmarc-record-check/

Awhile ago it came to light that the following needed to be added to SPF records for email-enabled domains using Constant Contact:

include:ccsend.com include:constantcontact.com include:confirmedcc.com

Things have gotten a lot better. The following now covers all of the above:

ip4:208.75.120.0/22

A very good SPF checker:

https://vamsoft.com/support/tools/spf-policy-tester

Here is possibly the original SPF checker:

http://www.kitterman.com/spf/validate.html

To do a deep study of a bounceback, the best tool this writer has ever seen is here:

https://testconnectivity.microsoft.com/

in the Message Analyzer tab. Just paste every header you have into there and submit, and then read. Lots and lots of excellent information comes up.

Try DavMail:

http://davmail.sourceforge.net

It runs in the background on server, desktop, or laptop (Windows, Linux, or Mac), and it translates native Exchange protocols into that which Thunderbird and appropriate add-ins handle very well. In other words, it acts as a live bridge between Exchange protocols and Thunderbird with Lightning, for contacts and calendar. The instructions are thorough and functional.

A few methods:

https://sendgrid.com/

https://mandrill.com/

http://smtp.com

The first two have free-of-charge tiers.

1. Create a new email.
2. Click the To: button.
3. Choose all of the contacts that you want to use to populate with.
4. Click OK. Do NOT send!

A recommended tool:

http://imapsync.lamiral.info/

Try this:

https://play.google.com/store/apps/details?id=com.syntomo.email

Something new, $10/year. Working great for me as of this writing.

https://addons.mozilla.org/en-US/thunderbird/addon/exquilla-exchange-web-services/