My mail is handled by a VPS with greylisting, with a wildcard alias. I have greylisting and stringent filtering turned on for most aliases (including my most pu

My mail is handled by a VPS with greylisting, with a wildcard alias. I have greylisting and stringent filtering turned on for most aliases (including my most public one, which is available all over the web) but I have an alias which is more private with no greylisting or spam filtering, which I give out to places I trust when I want a quick guaranteed reply. If the non-spam protected alias gets leaked, I simply change it - and it continues to work, with less spam protection. When dealing with sites I don't trust much, I instead make up an alias specific for that site so I'll know to trust them even less if I get spam to that alias.