For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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GuidesAPI ReferenceChangelog

Changelog

May 15, 2019
May 15, 2019

Multimedia Attachments Supported in Transactional Emails.

Support for audio and video attachments in Transactional Emails

The following formats are now be allowed:

  • Audio: .mp3, .m4a, .wma, .ogg, .flac, .wav, .aif, .aifc, .aiff
  • Video: .mp4, .m4v, .mov, .avi, .mkv, .mpeg, .mpg, .wmv
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