A method, system and computer program product for utilizing email as a transport mechanism for activity stream posting. The method, program system, and computer product may include receiving an email, with content, at a target email system of a target from a source email system of a source. Content that is to be posted to an activity stream is extracted from the email content. The extracted content is posted to the activity stream. The method, program system, and computer product may further include examining the email at the target to identify whether the email includes content that is to be posted to the activity stream, or the target email system may deliver the email to a designated email address mailbox assigned to emails containing content to be sent to the activity stream. A notification of the email may be provided or the mailbox may be checked for email.