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add TransportDirect transport

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The `TransportDirect` transport allows to tweak outgoing SMTP
connections to remote servers. Currently, it only allows to select
network IP family (ipv4, ipv6 or both).

For example, to disable ipv6 for all outgoing SMTP connections:
- add these lines in mox.conf to create a new transport named
"disableipv6":
```
Transports:
  disableipv6:
    Direct:
      DisableIpv6: true
```
- then add these lines in domains.conf to use this transport:
```
Routes:
  -
    Transport: disableipv6
```

fix #149
This commit is contained in:
Laurent Meunier
2024-04-08 21:50:30 +02:00
parent d74610c345
commit be570d1c7d
14 changed files with 124 additions and 36 deletions
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16
config/config.go
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@ -222,10 +222,11 @@ type WebService struct {
// be non-nil. The non-nil field represents the type of transport. For a
// transport with all fields nil, regular email delivery is done.
type Transport struct {
Submissions *TransportSMTP `sconf:"optional" sconf-doc:"Submission SMTP over a TLS connection to submit email to a remote queue."`
Submission *TransportSMTP `sconf:"optional" sconf-doc:"Submission SMTP over a plain TCP connection (possibly with STARTTLS) to submit email to a remote queue."`
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."`
Submissions *TransportSMTP `sconf:"optional" sconf-doc:"Submission SMTP over a TLS connection to submit email to a remote queue."`
Submission *TransportSMTP `sconf:"optional" sconf-doc:"Submission SMTP over a plain TCP connection (possibly with STARTTLS) to submit email to a remote queue."`
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."`
}
// TransportSMTP delivers messages by "submission" (SMTP, typically
@ -262,6 +263,13 @@ type TransportSocks struct {
Hostname dns.Domain `sconf:"-" json:"-"` // Parsed form of RemoteHostname
}
type TransportDirect struct {
DisableIPv4 bool `sconf:"optional" sconf-doc:"If set, outgoing SMTP connections will *NOT* use IPv4 addresses to connect to remote SMTP servers."`
DisableIPv6 bool `sconf:"optional" sconf-doc:"If set, outgoing SMTP connections will *NOT* use IPv6 addresses to connect to remote SMTP servers."`
IPFamily string `sconf:"-" json:"-"`
}
type Domain struct {
Description string `sconf:"optional" sconf-doc:"Free-form description of domain."`
ClientSettingsDomain string `sconf:"optional" sconf-doc:"Hostname for client settings instead of the mail server hostname. E.g. mail.<domain>. For future migration to another mail operator without requiring all clients to update their settings, it is convenient to have client settings that reference a subdomain of the hosted domain instead of the hostname of the server where the mail is currently hosted. If empty, the hostname of the mail server is used for client configurations. Unicode name."`