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Allow multiple localpart catch all separators, e.g. both "+" and "-", for addresses you+anything@example.com and you-anything@example.com

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The original config option stays, and we still use it for the common case where
we have a single separator. The "+" is configured by default. It is optional,
just like the new option "LocalpartCatchallSeparators" (plural).

When parsing the config file, we combine LocalpartCatchallSeparator and
LocalpartCatchallSeparators into a single list
LocalpartCatchallSeparatorsEffective, which we use throughout the code.

For issue #301 by janc13
This commit is contained in:
Mechiel Lukkien
2025-03-07 14:39:58 +01:00
parent d0b241499f
commit 9a8bb1134b
26 changed files with 255 additions and 95 deletions
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6
mox-/lookup.go
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@ -86,10 +86,10 @@ func LookupAddress(localpart smtp.Localpart, domain dns.Domain, allowPostmaster,
}
// CanonicalLocalpart returns the canonical localpart, removing optional catchall
// separator, and optionally lower-casing the string.
// separators, and optionally lower-casing the string.
func CanonicalLocalpart(localpart smtp.Localpart, d config.Domain) smtp.Localpart {
if d.LocalpartCatchallSeparator != "" {
t := strings.SplitN(string(localpart), d.LocalpartCatchallSeparator, 2)
for _, sep := range d.LocalpartCatchallSeparatorsEffective {
t := strings.SplitN(string(localpart), sep, 2)
localpart = smtp.Localpart(t[0])
}