Timo Sirainen, born 1979, is a Finnish programmer also known under the handles "cras" and "tss".

Sirainen is the original author of the IRC-client Irssi and the POP/IMAP server Dovecot.

He was formerly working for Rackspace Email & Apps[2] (formerly Mailtrust), where he continued the development of the Dovecot POP/IMAP server.

In March 2015, the companies Dovecot Oy and Open-Xchange SA announced a merger.

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