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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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4
smtpserver/server.go
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@ -2469,7 +2469,7 @@ func (c *conn) submit(ctx context.Context, recvHdrFor func(string) string, msgWr
var genFromID bool
if useFromID {
// With submission, user can bring their own fromid.
t := strings.SplitN(string(c.mailFrom.Localpart), confDom.LocalpartCatchallSeparator, 2)
t := strings.SplitN(string(c.mailFrom.Localpart), confDom.LocalpartCatchallSeparatorsEffective[0], 2)
localpartBase = t[0]
if len(t) == 2 {
fromID = t[1]
@ -2500,7 +2500,7 @@ func (c *conn) submit(ctx context.Context, recvHdrFor func(string) string, msgWr
if genFromID {
fromID = xrandomID(16)
}
fp.Localpart = smtp.Localpart(localpartBase + confDom.LocalpartCatchallSeparator + fromID)
fp.Localpart = smtp.Localpart(localpartBase + confDom.LocalpartCatchallSeparatorsEffective[0] + fromID)
}
// For multiple recipients, we don't make each message prefix unique, leaving out