Category: Email

SMTP conversation
article #133, updated 53 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

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DMARC analyzer
article #1284, updated 581 days ago

Here’s a good one:

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

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A web tool to test DKIM
article #1141, updated 1034 days ago

Here is one:

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

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Test DMARC record for a domain
article #1086, updated 1162 days ago

A free tool:

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

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SPF for Constant Contact
article #873, updated 1169 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

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SPF and Email Flow Analysis Tools
article #998, updated 1343 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.

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Exchange address book, calendar, and email for Thunderbird - Bridge Exchange to IMAP
article #398, updated 1771 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.

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Sending mass email marketing via SMTP
article #843, updated 1934 days ago

A few methods:

https://sendgrid.com/

https://mandrill.com/

http://smtp.com

The first two have free-of-charge tiers.

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Populate the Autocomplete in Outlook 2013
article #809, updated 2038 days ago

  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!

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Migrate IMAP accounts
article #771, updated 2142 days ago

A recommended tool:

http://imapsync.lamiral.info/

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