libetpan and SASL

Sorry for not searching the lists, but I get a search server error. If this 
has already been answered, please point me in the right direction.

I would like to know what types of SASL does libetpan support. I need to use 
these types and am not trying to implement anything new but I've been looking 
through the code to get some answers (libetpan-0.49, NOT the latest sources). 
My investigations have lead me to the following conclusions:

POP3 and IMAP: call the pop3_mailstorage_init_sasl and 
imap_mailstorage_init_sasl with NULL for auth_type and related arguments 
which cause the auth_type to fallback to plaintext. Is this correct?

I suppose that SMTP does the same. Am I correct in assuming this?

Thank you for your time!

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