mda command is missing one level of escaping, and thus cannot be used with quotes

[Ekleog]

Using something like action do_mda mda "/bin/foo \"bar\"", the equivalent of which worked in 6.3.0, no longer works in 6.4.0 by failing with mail.mda: mail.mda: only one command is supported, due to a missing escape in https://github.com/OpenSMTPD/OpenSMTPD/blob/portable/smtpd/parse.y#L681 I would guess.

[poolpOrg]

I will have a look at it this week, the issue is not where you think, it is caused by a fundamental change where we used to rely on an execve() system call to run the mda whereas we now pass the mda line to a shell so it gets a chance at parsing the mda line better than we did (ie: support globbing, etc...).

In the meantime, replace your "bar" with 'bar' (single quote, no escape) and it will solve your issue.

[ngortheone]

I will have a look at it this week

@poolpOrg what is the status of this?

[poolpOrg]

tricky issue with easy workarounds so not very high priority, will be dealt with when the more pressing issues are solved