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Pipeline MAIL FROM: and RCPT TO: commands. #48

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link2xt opened this issue Feb 23, 2022 · 1 comment · Fixed by #54
Closed

Pipeline MAIL FROM: and RCPT TO: commands. #48

link2xt opened this issue Feb 23, 2022 · 1 comment · Fixed by #54

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@link2xt
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link2xt commented Feb 23, 2022

Currently each command is only sent after receiving a reply for the previous one.

There is an await for each command:
https://github.com/async-email/async-smtp/blob/3e7a8f3de19fdeb19d14cf123a8696c49685d3fa/src/smtp/smtp_client.rs#L695
https://github.com/async-email/async-smtp/blob/3e7a8f3de19fdeb19d14cf123a8696c49685d3fa/src/smtp/smtp_client.rs#L705

This means on a high-latency connection you need an RTT per recipient. If you send a message to 10 users and RTT is 1 second, you wait 11 seconds before even starting to send the message.

See related post here:
chatmail/core#3092 (comment)
@link2xt
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link2xt commented Feb 23, 2022

There is a separate pipelining extension to allow grouping of MAIL TO, RCPT TO and DATA:
https://datatracker.ietf.org/doc/html/rfc2920

@link2xt link2xt mentioned this issue Jan 6, 2023
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Add pipelining extension support chatmail/async-smtp
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@link2xt