SMTP2GO VS SpamAssassin

I open a support ticket describing the situation, expecting that it is a simple oversight, but I receive a puzzling response. Their support person claims that this IP doesn't belong to them, and that it is owned by "Sand Dune Mail Ltd". I check the smtp2go.com privacy page, and it clearly lists the name of the company as "Sand Dune Mail Ltd". Source: 12 months ago

Hmm. Getting the IP address of a linode site instead of smtp2go.com would worry me. Source: 12 months ago

Our mail relay service smtp2go.com is what is causing the issue! Source: almost 2 years ago

Https://smtp2go.com maybe? Just discovered them the other day but yet to give it a whirl. Just when I was starting to double down on Postmark, they did this. Not blaming them, but we all know this is going to go badly (as a previous Active Campaign user). - Source: Hacker News / about 2 years ago

Why would it? My response will be sent through the SMTP server at smtp2go.com which has no idea what my Gmail address is. How does my "response to meeting invite" differ from my responses to other mass emails? Source: about 2 years ago

Spamassassin or rspamd or ASSP. All very good. Spamassassin just works, but you need to feed it a good cohort of spam and ham (about 1000 messages each). Most people only send it the spam which will then bias it quite a bit and not have it classify spam as spam unless it's the worst of the bunch. Spamassassin is a filter for your mail server. Rspamd is the same idea. ASSP is highly configurable and a proxy. Source: 10 months ago

I'm currently looking into using a Bayesian spam filter like Bogofilter or Apache Spamassassin to help out. I'd run the contents of my Contact Us form through the filter after the initial validation, and if the contents are below my spam threshold, I would actually send out the contact us request. Source: over 2 years ago

The famous spam filter SpamAssassin. Score: -0.6. A score below -5 is considered spam. -0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid This rule is automatically applied if your email contains a DKIM signature but other positive rules will also be added if your DKIM signature is valid. See immediately below. 0.1 DKIM_VALID Message has at least one valid DKIM or DK... Source: almost 3 years ago

To detect whether incoming emails are malicious, mail servers also use spam scanners, such as Apache's popular SpamAssasin. The internal workings of these spam scanners can be somewhat complicated (involving Naive Bayes Classifiers on trained, large datasets, for the curious), but the primary takeaway is that these classification systems typically assign a numerical point value to an incoming email to determine... - Source: dev.to / about 3 years ago