smtp: Allow RCPT TO command to fail for some recipients

Introduces CURLOPT_MAIL_RCPT_ALLLOWFAILS.

Verified with the new tests 3002-3007

Closes #4816
This commit is contained in:
Pavel Volgarev 2020-01-14 17:22:38 -05:00 committed by Daniel Stenberg
parent 23a17e039d
commit 4a4609bf3c
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22 changed files with 483 additions and 26 deletions

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Long: mail-rcpt-allowfails
Help: Allow RCPT TO command to fail for some recipients
Protocols: SMTP
Added: 7.69.0
---
When sending data to multiple recipients, by default curl will abort SMTP
conversation if at least one of the recipients causes RCPT TO command to
return an error.
The default behavior can be changed by passing --mail-rcpt-allowfails
command-line option which will make curl ignore errors and proceed with the
remaining valid recipients.
In case when all recipients cause RCPT TO command to fail, curl will abort SMTP
conversation and return the error received from to the last RCPT TO command.