> From: Russell Robinson

> I've got:
>       require verify = sender

> Recently tested: it always succeeds - i.e. allows invalid senders.

"verify=sender" checks domain only. If it allows invalid domains
then either an "accept" succeeded before this "require" or
blame the NS you use.

An attempt to check existence of a mailbox (i.e. to check whole
email address, not only domain) requires connection with the MX
and giving HELO, MAIL, RCPT commands - that is called "callout" in Exim.
Callouts to each sender is considered abuse and can cause you blacklisted.

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