feat(postfix): prefer IPv4 in SMTP client#900
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j-g00da
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Implements a new mode "transport", that allows filtermail to be used as a postfix pipe transport replacing postfix smtp client. SMTP client tries to open socket on all resolved addresses in parallel and uses one that succeeds the first, fixing the issue described in: <chatmail/relay#900> Extends the built-in SMTP client with STARTTLS support. Groundwork required for mxdeliv endpoint (HTTP channel for MTA-to-MTA communication): chatmail/relay#900 Signed-off-by: Jagoda Ślązak <[email protected]>
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