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View Code? Open in Web Editor NEWA minimalist client for sending mail direct to recipient's MX
License: MIT License
A minimalist client for sending mail direct to recipient's MX
License: MIT License
MX records are processed in the order DNS returns rather than according to priority. This may prevent successful delivery with some receiving domain setups. Results should be sorted by priority, and there might should be treatment of early errors (e.g. in initial greeting) as cause to try the next MX rather than a temp failure to report via exit status (RFC is ambiguous on requirements here and existing mailers differ).
RFC 7671 introduced a new allowance (section 5.2) that servers may omit the trust anchor certificate from the cert chain sent to the client if it's included in full (not hash) in the TLSA record and all TLSA records are of this form ("2 0 0"). This is a rather awful usage, since it requires gigantic DNS messages, but it should be supported since the standard allows it. I believe the right way to do it is by pre-processing the TLSA records to put the trust anchor(s) they define into a chain to pass into br_ssl_client_init_full
. I'm not doing it yet since this is a low-priority feature, but documenting it here so it can be done later.
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