LowEndBox - Cheap VPS, Hosting and Dedicated Server Deals

Provider Tip: "SMTP Test" is Rarely an SMTP Test

SMTPRecently, a LowEndTalk member ticketed in complaining of a problem they were having with NameCrane, a shared hosting (and now email hosting) provider.

His complaint was that NameCrane blocks some emails.  In fact, you can read the entire ticket thread because he posted it on LowEndTalk.

Needless to say, the LowEndTalk/LowEndBox support desk is not the place for this issue.  We are not a court that resolves issues between users and providers.

But the resolution of the issue is interesting.  Long story short:

The interesting thing is why the emails bounced.

NameCrane had created a custom anti-spam rule that said “if the subject is ‘SMTP Test’, mark it as spam”.  Why?  Per the ticket:

“Users get their emails compromised and then they’re abused for SPAM.  99% of the time, the spammers send an email with the subject as ‘SMTP Test’ or a handful of others…”

Fascinating.  So because spammers are lazy and uncreative, it’s easy to spot their initial probes.

If I was a provider running an email service, I’d look into creating similar rules.

raindog308

1 Comment

  1. jarland:

    Actually the string “SMTP Test” in an email subject is almost always just an SMTP test. Some examples of common ones:

    “Vaultwarden SMTP Test”
    “Mailspring SMTP Test Email”
    “Postman SMTP Test”

    December 5, 2024 @ 3:07 pm | Reply

Leave a Reply

Some notes on commenting on LowEndBox:

  • Do not use LowEndBox for support issues. Go to your hosting provider and issue a ticket there. Coming here saying "my VPS is down, what do I do?!" will only have your comments removed.
  • Akismet is used for spam detection. Some comments may be held temporarily for manual approval.
  • Use <pre>...</pre> to quote the output from your terminal/console, or consider using a pastebin service.

Your email address will not be published. Required fields are marked *