Boj se SPAMy

Pokud bojujete se SPAMY, zkuste se podívat po následujících technologiích.
Všechny 3 níže uvedené se konfigurují skrz záznam v DNS.

SPF


www.openspf.org
SPF allows brands to specify who can send email on behalf of their domain. Brands list the IP addresses of authorized senders in a DNS record. If the IP address sending email on behalf of the brand isn’t listed in that SPF record, the message fails SPF authentication.

DKIM
www.dkim.org
DKIM allows an organization to take responsibility for transmitting a message in a way that can be verified by the email provider. This verification is made possible through cryptographic authentication within the digital signature of the email.

DMARC
www.dmarc.org
DMARC ensures that legitimate email is properly authenticating against established DKIM and SPF
standards, and that fraudulent activity appearing to come from domains under a brand’s control is blocked before ever reaching the customer’s inbox.

Pěkný popis v CZ: http://www.root.cz/clanky/dmarc-overeni-odesilatelovy-domeny/
Tools: https://dmarc.org/resources/deployment-tools/