I’m sorry I didn’t see this earlier. There is a bug I’m proposing a patch upstream for this : Can't create (Strato) POP3-Account (SFOS 5.2.0.16) for general e-mail - #8 by dcaliste
[5.1.0.11] up to [5.2.0.17][JP2601] can't create pop mail account manually (confirmed by two people)
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