Strange Error: Password data is not valid for scheme SHA256. Please help me resolve it.

[Alexander Dalloz]

Am 24.07.2017 um 00:18 schrieb david.madman2 at vfemail.net:
> Just to add to my previous message:
> 
> I modified the args= in the passdb section of /etc/dovecot/passwd.db 
> from SHA256 to SHA256-CRYPT which gave a different error when I tried to 
> do the same creation of the account in Thunderbird. The new error is:
> 
> Jul 23 22:12:23 www dovecot: auth: 
> passwd-file(test at domain.com,46.xxx.xxx.xxx,<u4CLZBNVys4u8ic/>): Password 
> mismatch

"Password mismatch" sounds to be clear.

Did you verify the SHA256-CRYPT hash?

doveadm pw -t 
'{SHA256-CRYPT}$5$JYfSN2ogeOpMRPqA$zcojaWG0u35PYX5EYCHlRJiJyJg35.gSYURZy8T.FS8'
Enter password to verify:
{SHA256-CRYPT}$5$JYfSN2ogeOpMRPqA$zcojaWG0u35PYX5EYCHlRJiJyJg35.gSYURZy8T.FS8 
(verified)

And which type of authentication method did you choose in Thunderbird? 
It should be "password, normal".

Alexander