451 4.7.1 Service unavailable – try again later

  • May 19, 2013
  • Plesk

Good old Plesk.

After an update yesterday, the Plesk milter greylisting has been confused, and returning 451 4.7.1 Service unavailable – try again later for all mail.

Disabling grey listing within Plesk has at least allowed mail to now be delivered while i investigate, though no doubt Parallels will have a fix in the next update.

Server > Mail Settings > Spam Filter Settings.

Untick “Switch on server-wide greylisting spam protection”.




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