Spam (Ham)


A spam is an unsolicited mail.

It's also known as:

  • Unsolicited Bulk Email (UBE)
  • or Unsolicited Commercial Email (UCE)

Ham vs Spam

The opposite of Spam is known as Ham for a legit email

The ratio of ham/spam is:

  • for blog (90%) (comment/trackback)
  • for email (98%)

Spam Ham Ratio 1)

How to Avoid


With mail authentication:

  • your mail server needs to be listed publicly
  • your mail needs to be signed

For more information, see What is Email Authentication?

Grey Listing

Greylisting 2) is based on the fact that a Spam server will never try to send the email again, the first email received from an unknown sender is rejected and is placed in a greylisting, and if the SMTP server sends it again after the grace period, the sender is placed on the whitelist.

spamd has a rejection based on greylisting.


Blacklisting / IP Blocklist

A list of IP/mail that should be blocked. Email - Blacklist


Spam may be indirect.

For instance:

  • when a comment is posted, an email is send to the subscriber and the administrator receive it.

Spam trap

A spam trap is an email address that’s not actively used but is actively monitored. If a spam trap receives an email, something is rotten because that email address never opted in to receive emails.

Spam Email

Spam emails use the unsubscribe option to confirm that your email is in fact legit and active.



Email - Score

Documentation / Reference

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