Change in behavior of Challenge Response System
Posted: 12 Jul 2015, 07:58
Dear TrashMail customers,
we just changed the behavior of the challenge response system.
Now only the "From" address is checked in the whitelist process. Before it was the "From" and "To"-address to be compatible with some mailing list system.
The problem is that some spammer sent emails by faking the "To"-address in the email content but sending over the SMTP protocol to another recipient (there are two To-adresses, one in the SMTP protocol, and one in the email content), so people using the challenge-response system could got spam even with a valid whitelist system.
Best regards,
Admin
we just changed the behavior of the challenge response system.
Now only the "From" address is checked in the whitelist process. Before it was the "From" and "To"-address to be compatible with some mailing list system.
The problem is that some spammer sent emails by faking the "To"-address in the email content but sending over the SMTP protocol to another recipient (there are two To-adresses, one in the SMTP protocol, and one in the email content), so people using the challenge-response system could got spam even with a valid whitelist system.
Best regards,
Admin