A. Schulze:
> > The problem I have is when I set address_verify_negative_cache = no.
...
> > It looks like when there is status=undeliverable-but-not-cached
There is no such reply. In reality, the reply is that the address
probe is in progress (DEL_RCPT_STAT_TODO).
This is what happens:
1. SMTP daemon queries verify service for an address probe result.
2. There is no address probe result. This triggers a verify probe.
3. Repeat 1 until the addres probe poll count is reached.
I don't see how one would avoid this, other than by blocking the
SMTP daemon's query while a probe is in progress or until a time
limit is reached.
If you want to create accounts on the fly, don't break address
verification.
Instead, change your local_recipient_maps, virtual_alias_maps,
relay_recipient_maps or virtual_mailbox_maps. At the end of those
maps, a tcp_table or socketmap service that handles the queries for
non-existent addresses. This service replies with 5xx if the account
should not exist, or it replies with 4xx and creates the account.
Wietse
