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  • Can you explain why nullmailer should not be used? Is it because of the reasons mentioned in unix.stackexchange.com/questions/1449/…? Which MTA would you recommend? Commented Jun 30, 2015 at 1:30
  • @CameronMartin Nullmailer only forwards mail to a remote machine, it doesn't do local delivery. You can use it if you have an SMTP server somewhere that accepts mail from your machine, but not if you're delivering the mail locally. I've edited my answer to clarify. Commented Jun 30, 2015 at 1:33
  • In madm v4 the device details option has moved; you need to run mdadm --misc -D /dev/md0 Commented May 2, 2021 at 23:51
  • @JonathanHolvey In what version, exactly? --misc is still optional in 4.1 and is still documented as such in Git (“Misc mode to be assumed”.). Commented May 3, 2021 at 9:05
  • Thanks for pointing this out @Gilles'SO-stopbeingevil'. It must have been user error, as omitting --misc is working fine for me now. Commented May 4, 2021 at 0:43