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add "Fail" transport, that immediately fails delivery

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allows configs that prevent outgoing deliveries (globally, per domain,
or per account) from/to certain domains.

for issue #347
This commit is contained in:
Mechiel Lukkien
2025-05-15 17:59:49 +02:00
parent 91bfff220e
commit bb438488c5
7 changed files with 123 additions and 4 deletions
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11
config/config.go
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@ -235,6 +235,7 @@ type Transport struct {
SMTP *TransportSMTP `sconf:"optional" sconf-doc:"SMTP over a plain connection (possibly with STARTTLS), typically for old-fashioned unauthenticated relaying to a remote queue."`
Socks *TransportSocks `sconf:"optional" sconf-doc:"Like regular direct delivery, but makes outgoing connections through a SOCKS proxy."`
Direct *TransportDirect `sconf:"optional" sconf-doc:"Like regular direct delivery, but allows to tweak outgoing connections."`
Fail *TransportFail `sconf:"optional" sconf-doc:"Immediately fails the delivery attempt."`
}
// TransportSMTP delivers messages by "submission" (SMTP, typically
@ -278,6 +279,16 @@ type TransportDirect struct {
IPFamily string `sconf:"-" json:"-"`
}
// TransportFail is a transport that fails all delivery attempts.
type TransportFail struct {
SMTPCode int `sconf:"optional" sconf-doc:"SMTP error code and optional enhanced error code to use for the failure. If empty, 554 is used (transaction failed)."`
SMTPMessage string `sconf:"optional" sconf-doc:"Message to include for the rejection. It will be shown in the DSN."`
// Effective values to use, set when parsing.
Code int `sconf:"-"`
Message string `sconf:"-"`
}
type Domain struct {
Disabled bool `sconf:"optional" sconf-doc:"Disabled domains can be useful during/before migrations. Domains that are disabled can still be configured like normal, including adding addresses using the domain to accounts. However, disabled domains: 1. Do not try to fetch ACME certificates. TLS connections to host names involving the email domain will fail. A TLS certificate for the hostname (that wil be used as MX) itself will be requested. 2. Incoming deliveries over SMTP are rejected with a temporary error '450 4.2.1 recipient domain temporarily disabled'. 3. Submissions over SMTP using an (envelope) SMTP MAIL FROM address or message 'From' address of a disabled domain will be rejected with a temporary error '451 4.3.0 sender domain temporarily disabled'. Note that accounts with addresses at disabled domains can still log in and read email (unless the account itself is disabled)."`
Description string `sconf:"optional" sconf-doc:"Free-form description of domain."`

10
config/doc.go
View File

@ -725,6 +725,16 @@ See https://pkg.go.dev/github.com/mjl-/sconf for details.
# remote SMTP servers. (optional)
DisableIPv6: false
# Immediately fails the delivery attempt. (optional)
Fail:
# SMTP error code and optional enhanced error code to use for the failure. If
# empty, 554 is used (transaction failed). (optional)
SMTPCode: 0
# Message to include for the rejection. It will be shown in the DSN. (optional)
SMTPMessage:
# Do not send DMARC reports (aggregate only). By default, aggregate reports on
# DMARC evaluations are sent to domains if their DMARC policy requests them.
# Reports are sent at whole hours, with a minimum of 1 hour and maximum of 24