What is SPAM ?
"SPAM are messages sent via e-mail that the user does not want to receive."
This definition shows that a SPAM filter is always also a personal and individual choice. Compared to the situation 10 years ago when only one of 100 e-mails contained unwelcome advertising, today 99% of all e-mails are SPAM messages that are sent automatically and need to be filtered.
At SerNet, anti-SPAM measures consist of seven consecutive measures:
- SMTP connection: checking for syntactic correctness
- Checking receiver/sender, optionally with grey listing
- Checking with IP blocking lists
- Checking file attachment types
- Checking with SpamAssassin with extended rule set
- If necessary, handover to Avira MailGate
- Transfer to an internal e-mail server and an e-mail client with individual junk filter
With these measures, a high percentage of SPAM can be filtered.
Don't believe anyone who promises you 100% SPAM protection. Too many "false positives" are created with such a solution, and e-mails that you would like to receive are rejected. SerNet also advises not to outsource SPAM protection to e-mail gateway operators on the Internet. To date we don't know any operator who can take all data protection concerns into account.