Citeren Sebastian Nielsen <sebast...@sebbe.eu>:
Because when I email to friends that are using gmail, my mail ends up in spam unless my friends put me in whitelist. Seems to vary however, and seems to get better with time.
In order to prevent ending up in spam in GMail, it is necessary to have working DKIM and/or SPF for your messages and forward- and reverse DNS records for your mailserver match.
