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smtpserver: In localserve mode, don't reject messages "From" domain "localhost" if it doesn't resolve to an IP

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Mox does not look up names from the /etc/hosts file, only through DNS. But
"localhost" may not resolve through DNS, or when offline a DNS server may not
even be available. We will want deliveries to work in "mox localserve" mode.

Found by dstotijn.
This commit is contained in:
Mechiel Lukkien 2025-03-07 11:39:24 +01:00
parent 2fc75b5b7b
commit d0b241499f
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1 changed files with 5 additions and 1 deletions
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6
smtpserver/server.go
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@ -1872,7 +1872,11 @@ func (c *conn) cmdMail(p *parser) {
if err != nil {
c.log.Infox("temporary reject for temporary mx lookup error", err)
xsmtpServerErrorf(codes{smtp.C451LocalErr, smtp.SeNet4Other0}, "cannot verify mx records for mailfrom domain")
} else if !valid {
} else if !valid && !(Localserve && rpath.IPDomain.Domain.ASCII == "localhost") {
// We don't reject for "localhost" in Localserve mode because we only resolve
// through DNS, not an /etc/hosts file, and localhost may not resolve through DNS,
// depending on network environment.
c.log.Info("permanent reject because mailfrom domain does not accept mail")
xsmtpUserErrorf(smtp.C550MailboxUnavail, smtp.SePol7SenderHasNullMX27, "mailfrom domain not configured for mail")
}