dovecotpw -u username -s encryptiontype

get a list of possible encryption schemes

dovecotpw -l

CRYPT MD5 MD5-CRYPT SHA SHA1 SHA256 SMD5 SSHA PLAIN CLEARTEXT CRAM-MD5 HMAC-MD5 DIGEST-MD5 PLAIN-MD4 PLAIN-MD5 LDAP-MD5 LANMAN NTLM OTP SKEY RPA

encrypted passwords for use with dovecot