SMTP Relay

Connecting to the SMTP Relay

This is a closed service only available to our supplier Gamma NextGen Broadband customers. This is a relay service only and Gamma takes no responsibility for email content filtering or other regulatory compliance e.g. logging of message traffic.


Gamma's SMTP relay can be found at smtprelay.business-access.co.uk. No other credentials are required.

Bulk Mailing

Gamma’s SMTP Relay does not support bulk mailing. Bulk mailing is defined as:


E-mails with more than 120 recipients per email


Sending E-mails at a rate of over 10 emails per minute

Other Restrictions

Gamma’s SMTP Relay will not process E-mails that are larger than 28 Mega Bytes (MB) in size.

Potential Error Messages

  • Relaying denied – Not a recognised IP address.
  • Relaying denied by ISP – We have specifically blocked this user. There may be an active ticket regarding it.
  • Admin Prob – Max recipients reached, as above.
  • Rate Limit exceeded – Limit above reached.
  • Size to big – As above, for the email and it's attachments.
We explicitly reserve the right to change the rules governing the SMTP relay service at any time with or without prior notice

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