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add config option to reject incoming deliveries with an error during the smtp transaction

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useful when a catchall is configured, and messages to some address need to be
rejected.

would have been nicer if this could be part of a ruleset. but evaluating a
ruleset requires us to have the message (so we can match on headers, etc). but
we can't reject messages to individual recipients during the DATA command in
smtp. that would reject the entire delivery attempt.

for issue #156 by ally9335
This commit is contained in:
Mechiel Lukkien
2025-01-24 16:51:21 +01:00
parent 8b26e3c972
commit 3e2695323c
13 changed files with 115 additions and 11 deletions
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11
config/config.go
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@ -455,13 +455,18 @@ type JunkFilter struct {
}
type Destination struct {
Mailbox string `sconf:"optional" sconf-doc:"Mailbox to deliver to if none of Rulesets match. Default: Inbox."`
Rulesets []Ruleset `sconf:"optional" sconf-doc:"Delivery rules based on message and SMTP transaction. You may want to match each mailing list by SMTP MailFrom address, VerifiedDomain and/or List-ID header (typically <listname.example.org> if the list address is listname@example.org), delivering them to their own mailbox."`
FullName string `sconf:"optional" sconf-doc:"Full name to use in message From header when composing messages coming from this address with webmail."`
Mailbox string `sconf:"optional" sconf-doc:"Mailbox to deliver to if none of Rulesets match. Default: Inbox."`
Rulesets []Ruleset `sconf:"optional" sconf-doc:"Delivery rules based on message and SMTP transaction. You may want to match each mailing list by SMTP MailFrom address, VerifiedDomain and/or List-ID header (typically <listname.example.org> if the list address is listname@example.org), delivering them to their own mailbox."`
SMTPError string `sconf:"optional" sconf-doc:"If non-empty, incoming delivery attempts to this destination will be rejected during SMTP RCPT TO with this error response line. Useful when a catchall address is configured for the domain and messages to some addresses should be rejected. The response line must start with an error code. Currently the following error resonse codes are allowed: 421 (temporary local error), 550 (user not found). If the line consists of only an error code, an appropriate error message is added. Rejecting messages with a 4xx code invites later retries by the remote, while 5xx codes should prevent further delivery attempts."`
FullName string `sconf:"optional" sconf-doc:"Full name to use in message From header when composing messages coming from this address with webmail."`
DMARCReports bool `sconf:"-" json:"-"`
HostTLSReports bool `sconf:"-" json:"-"`
DomainTLSReports bool `sconf:"-" json:"-"`
// Ready to use in SMTP responses.
SMTPErrorCode int `sconf:"-" json:"-"`
SMTPErrorSecode string `sconf:"-" json:"-"`
SMTPErrorMsg string `sconf:"-" json:"-"`
}
// Equal returns whether d and o are equal, only looking at their user-changeable fields.