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Posts Tagged ‘smtp tls’

Stopping Forged Email 4: Your Last Resorts

Wednesday, March 4th, 2015

In previous posts we have examined how hackers and spammers can send forged email and how it can be extremely difficult to differentiate these messages from legitimate messages.  We have looked at the various common techniques for anti-fraud such as SPFDKIM, and DMARC and seen that, while these technologies can help a lot, they all have limitations; they all require strict and proper setup by the owner of the purported sender’s domain, and they must be well supported by your own spam filtering system.

Yet even with these technologies, it’s not hard in many cases for a determined attacker to send you a forged, fraudulent email message that still looks and feels legitimate.

What else can you do to validate email messages and protect yourself from phishing or social engineering attacks?

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Who does not support SMTP TLS for Secure Inbound Email Delivery?

Thursday, November 7th, 2013

We are frequently asked who supports TLS  to secure inbound email delivery. This is especially important for customers who need to be HIPAA-compliant, as email transport encryption over TLS is sufficient for HIPAA-compliant communications to end-users, so long as the TLS is configured to be sufficiently strong.

While it is possible to tell who supports TLS, it is somewhat technical to do it yourself. So, we have assembled a table with many of the most popular free and public email domains in use across the internet. We indicate which currently (as of July 8, 2022) supports SMTP TLS for inbound email.

The results are surprising. A majority of domains these days do support TLS. With Microsoft’s recent TLS implementation on its email domains (hotmail.com/live.com/outlook.com), this rounds out consistent TLS support (for inbound delivery–outbound may or may not be supported) for all of the most popular free email providers (e.g., aol.com, gmail.com yahoo.com, hotmail.com).

Note: lists below have been updated as of 7/8/22.

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