Wizard IT Products

Is there any way to block emails with an empty or invalid TO field?

Best Regards

Unfortunately there is not a method in MagicSpam for this yet.

While we have considered it in the past, and our PRO versions have several complementary SpamAssassin filtering rules that investigate this behavior for additive scoring, the sad reality is that a very high number of legitimate systems make use of 'undisclosed-recipients' as part of their standard practice - legitimate opt in mailing lists and the like.