We’ve seen an increased demand over the last few months for the ability to safelist and blacklist email senders through desktop email software clients like Microsoft Outlook, Mozilla Thunderbird, and others. We provide these capabilities inside of webmail, but we don’t provide these capabilities through the email software clients. We do, however, have documented APIs that would allow a developer or service provider to build this functionality (and much more). Check out our API wiki, if you’re interested in learning more about our APIs.
If you’re a developer or service provider interested in working with our APIs, we’re interested in talking to you. If so, please leave a comment here or email me and let’s chat.