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Whitelisting/Blacklisting BATV and VERP addresses

Dominic -

How can I Whitelist or Blacklist BATV and/or VERP addresses?


  • on-premises mail server Installations: Version 7.7.1+

In an attempt to mitigate backscatter, mass-mailing applications like MailChimp, SendGrid and Mailgun may use Bounce Address Tag Validation (BATV) to determine the validity of a specified bounce address within an email. Within the <local-part> of the Mail From: field, BATV denotes the use of a tagging scheme that allows bounced mail to be assessed for validity and dropped accordingly. An example of an address using BATV may appear as follows:

  • Mail From: <>

While BATV validates bounces, Variable Envelope Return Path (VERP) is implemented by mailing lists to automate recognition and removal of in-valid recipients.

The combination of these mass-mailing techniques can ultimately effect the approach towards implementing Whitelists and Blacklists to govern what mail reaches your INBOX.



User Level Management

Target the <domain-part> of the email address by adding it to either your Whitelist senders or Blacklist senders, available from: Settings -> Anti-Spam Settings.

For example, to Whitelist:

  • <>
  • <>
  • <>

    while Blacklisting:

  • <>
  • <>

    Please find the following example:



Remember to click Save Settings to push your new changes to your profile on our cloud.


Administrative Network Management

Mass-Mailing services may also send from a specific subnet. These networks can be conveniently trusted to bypass SpamAssassin by adding them to trusted_networks in /usr/local/atmail/spamassassin/etc/mail/spamassassin/

Multiple networks can be added and should be separated by white space in the configuration. In the following example, we have added to our list of trusted_networks.

# The IP's which are trusted
trusted_networks 192.168/16

Restart atmailserver allowing SpamAssassin to re-read its configuration.

# /etc/init.d/atmailserver restart

Our SpamAssassin will now automatically trust all mail deriving from the subnet.


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