go-pkgz / email / 32195979123

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Add SendContext to bound the whole SMTP transaction (#29)

TimeOut applies to the connection setup only, so a server which accepts
the connection and stalls afterwards blocks Send forever: greeting, auth,
recipients, body and QUIT have no deadline and no way to be canceled.

SendContext dials with the context and closes the connection as soon as
the context is done, which is the only way to interrupt net/smtp calls as
they take no context. Send keeps its signature and behaviour, calling
SendContext with a background context.

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