New mail quota ignored after limit has been exceeded

Do you confirm some of your clients use the POP3 protocol? Could you make a test?

  • Disable POP3 protocol from “Email” page
  • Increase custom quota to 5GB
  • See what happens

Yes
Some of my clients use the POP3 or IMAP
all clients use Thunderbird 52.5.2 (IMAP or POP3)
Some of my clients use Webmail Roundecube

Yes
same error

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