https://bugs.exim.org/show_bug.cgi?id=3146
Bug ID: 3146
Summary: smtp transport: option to filter host list
Product: Exim
Version: 4.98
Hardware: All
OS: All
Status: NEW
Severity: wishlist
Priority: medium
Component: Transports
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Use case: doing ipv4-only to outlook-hosted domains.
The dnslookup router can't filter because the MX result is not known early
enough.
Propose a bool, expanded, option on the smtp transport that can say yes/no for
individual IP addrs resulting from the domain/MX/A lookup sequence.
Considerations: when is the A or AAAA lookup done? If by the router then the
tpt
gets handed IPs and must (for this usecase) interpret v4 vs. v6. If by the tpt
then the tpt gets handed names and could just specify v4-only A-lookup
(supporting only the limited usecase. The "filter" mech above is more flexible
-
could eg. filter by AS or by country.
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