Something new:
Category: Email
Send passwords securely
article #1525, updated 43 days ago

Betterbird: Vastly Improved Fork of Thunderbird
article #1520, updated 68 days ago
Try it. https://www.betterbird.eu/. The Thunderbird team has been ignoring huge quantities of bugs and usability issues for decades. They kicked out a profoundly gifted developer several years ago, who has been leading Betterbird, a careful “soft fork” of Thunderbird, which maintains all helpful interoperability while fixing many, many bugs. Betterbird is lighter and faster, it does CardDav address books natively to Gmail and other providers, it has a far better HTML email composer, and much, more more!

Report Bad Actor Emails
article #1413, updated 829 days ago
If (when) anyone gets a bad actor email, i.e., a “phishing” scam trying to produce misdirection of funds and/or identity theft, those emails should be sent here:
reportphishing@apwg.com
and if it was sent from or arrived into a Microsoft mailbox, also here:
phish@office365.microsoft.com

SMTP conversation
article #133, updated 980 days ago
A sample SMTP conversation. Blue is transmit, red is receive; all exists within a command-prompt window. The messages received will vary somewhat, but the initial numbers won’t. The greater-than and less-than signs (< >) are required. The below works fine in Cygwin with ‘inetutils’ installed (which includes ‘telnet’), or in CMD with the Windows ‘telnet’ installed. Linuxes obviously have various telnets! ‘putty’ on Windows will do it also, in telnet mode, port 25, just replace the first line with GUI putty setup.
telnet mail.srcdomain.com 25
220 mail.destdomain.com ESMTP
HELO test.srcdomain.com
250 mail.destdomain.com
MAIL FROM: <email@srcdomain.com>
250 2.1.0 Sender OK
RCPT TO: <email@destdomain.com>
250 2.1.5 Ok
DATA
354 Enter mail, end with “.” on a line by itself
testing
testing
testing
.
250 2.0.0 Ok: queued as xxxxxxx

DMARC analyzer
article #1284, updated 1508 days ago
Here’s a good one:

A web tool to test DKIM
article #1141, updated 1961 days ago
Here is one:

Test DMARC record for a domain
article #1086, updated 2089 days ago

SPF for Constant Contact
article #873, updated 2096 days ago
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

SPF and Email Flow Analysis Tools
article #998, updated 2270 days ago
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.

Exchange address book, calendar, and email for Thunderbird - Bridge Exchange to IMAP
article #398, updated 2698 days ago
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.