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queue: deliver to multiple recipients in a single smtp transaction

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transferring the data only once. we only do this when the recipient domains
are the same. when queuing, we now take care to set the same NextAttempt
timestamp, so queued messages are actually eligable for combined delivery.

this adds a DeliverMultiple to the smtp client. for pipelined requests, it will
send all RCPT TO (and MAIL and DATA) in one go, and handles the various
responses and error conditions, returning either an overal error, or per
recipient smtp responses. the results of the smtp LIMITS extension are also
available in the smtp client now.

this also takes the "LIMITS RCPTMAX" smtp extension into account: if the server
only accepts a single recipient, we won't send multiple.
if a server doesn't announce a RCPTMAX limit, but still has one (like mox does
for non-spf-verified transactions), we'll recognize code 452 and 552 (for
historic reasons) as temporary error, and try again in a separate transaction
immediately after. we don't yet implement "LIMITS MAILMAX", doesn't seem likely
in practice.
This commit is contained in:
Mechiel Lukkien
2024-03-07 10:07:53 +01:00
parent 8550a5af45
commit 9e7d6b85b7
19 changed files with 1158 additions and 379 deletions
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2
webadmin/api.json
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@ -3372,7 +3372,7 @@
},
{
"Name": "BaseID",
"Docs": "A message for multiple recipients will get a BaseID that is identical to the first Msg.ID queued. They may be delivered in a single SMTP transaction if they are going to the same mail server. For messages with a single recipient, this field will be 0.",
"Docs": "A message for multiple recipients will get a BaseID that is identical to the first Msg.ID queued. The message contents will be identical for each recipient, including MsgPrefix. If other properties are identical too, including recipient domain, multiple Msgs may be delivered in a single SMTP transaction. For messages with a single recipient, this field will be 0.",
"Typewords": [
"int64"
]

2
webadmin/api.ts
View File

@ -471,7 +471,7 @@ export interface ClientConfigsEntry {
// queueing related fields.
export interface Msg {
ID: number
BaseID: number // A message for multiple recipients will get a BaseID that is identical to the first Msg.ID queued. They may be delivered in a single SMTP transaction if they are going to the same mail server. For messages with a single recipient, this field will be 0.
BaseID: number // A message for multiple recipients will get a BaseID that is identical to the first Msg.ID queued. The message contents will be identical for each recipient, including MsgPrefix. If other properties are identical too, including recipient domain, multiple Msgs may be delivered in a single SMTP transaction. For messages with a single recipient, this field will be 0.
Queued: Date
SenderAccount: string // Failures are delivered back to this local account. Also used for routing.
SenderLocalpart: Localpart // Should be a local user and domain.