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BOL Mail


The following technical requirements apply to the Internet e-mail (e-mail) delivery through BOL network.

  1. BOL's servers will not accept connections from unsecured systems. These include open relays, open proxies or any other system that has been determined to be applicable for unauthorized use.
  2. BOL's mail servers will not accept connections from systems that use dynamic or residential assigned IP addresses.
  3. BOL will not deliver e-mail that contains suspicious messages, which might violate the filtering rules, such as the hex-encoded Universal Resource Locator (URL). (Ex: http://%6d%6e%3f/), text or html-encoded files with base64.
  4. BOL's mail servers can reject connections from any IP address that does not comply with the RFC 1912 guidelines, including the reverse DNS settings (a PTR authoritative and valid record requirement).
  5. BOL’s analysis system scans the flow of e-mail messages and can reject connections from servers suspected of sending SPAM.
  6. BOL may reject connections from servers whose recipient lists consistently generate a higher than 10% bounce failure rate. (e.g. over 10% of a sender's mailing list is destined for users that do not exist on our system)
  7. BOL may reject connections from senders who are unable to accept at least 90% of the bounce-return messages (mailer-daemon failure/error messages) destined for their systems.
  8. Complaints submitted by BOL customers will be used as a basis for refusing connections from any mail server.
  9. BOL can reject messages when the origin of the IP address connection is defined as not valid on your SPF entry, for all domains that have published the SPF record.
  10. BOL publishes the SPF record and recommends its validation for messages whose sender’s domain is “uol.com.br.”

If you have any questions, please contact us through this form.