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Re:NIST’s new password rules – what you need to know by colanderman on Tuesday November 22, 2016 @06:35PM (#13018633)
Yep. FastMail restricts spaces in passwords due to mail clients that do not allow them.
Re:NIST’s new password rules – what you need to know by nmjenkins on Tuesday November 22, 2016 @08:30PM (#13019207)
(FastMail developer here)

The issue was actually that we support many different protocols (not just mail) and some combinations of clients/protocols have had issues in the past (it might have been some FTP clients I think, but can't remember right now.)

Anyway, this restriction no longer applies as we now require server-generated app passwords for 3rd party apps: https://www.fastmail.com/help/clients/apppassword.html. So feel free to use as many spaces as you like in your password!

Re:NIST’s new password rules – what you need to know by colanderman on Wednesday November 23, 2016 @11:29PM (#13028091)
I didn't know that, thanks, and thanks for providing a product I can rely on!
Re:NIST’s new password rules – what you need to know by kibwen on Tuesday November 22, 2016 @07:24PM (#13018901)
Which clients specifically?