Email service limits
search cancel

Email service limits


Article ID: 150824


Updated On:




 Entry limits in Email Security.Cloud platform.


The below list contains limits most often asked about by Email customers.

Please note that some limits can be changed on request, these have been marked in green below.


 - General limits -


  • 500      Recipients per email
  • 100      Commands per connection (e.g. SMTP Pipelining)
  • 78        Characters [RFC] Email subject length
  • 7          Maximum number of days an email can wait for retry in the mail queue

Track and trace

  • 1000     track and trace results in ClientNet UI
  • 10,000  track and trace results by email (per datacenter, so may yield more)
  • 30        minutes Track & Trace API timeout


  • 160,000 lines in the ClientNet report CSV
  • 100 domains per customer (can be raised on request)


 - Anti-Spam -

Group/User Limits (can be raised on request)

  • 20      groups per domain
  • 150    group users per domain
  • 150    approved senders per group
  • 150    blocked senders per group
  • 150    approved senders per recipient (user)
  • 150    blocked senders per recipient (user)

Global Approved and Blocked senders list limit

  • 3000 senders across both approved and blocked lists per customer