can't start Dovecot on Debian 7 following Linode guide

Hi

I followed this guide to setting up Email with Postfix. Dovecot and MySql:

https://library.linode.com/email/postfi … 0.19-mysql">https://library.linode.com/email/postfix/postfix2.9.6-dovecot2.0.19-mysql

Towards the end of the process you are asked to start up Dovecot and I then get this error:

Starting IMAP/POP3 mail server: dovecotFatal: service(lmtp) access(/usr/lib/dovecot/lmtp) failed: No such file or directory

failed!

I've confirmed that the error message is correct and that there i s no such file as 'lmtp' in that directory. I've also been through the whole guide a second time to make sure that I have followed it exactly.

Any help gratefully received.