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I checked out Posteo and noticed on the sign-up page it does not allow certain symbols in passwords. I get the error message: "[password] is invalid (must have at least one lower case and one upper case letter as well as one number or symbol - diacritics and exotic symbols are not allowed)" Wonder why that is.

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I have no idea why they disallow those. But you could email them and ask. They usually respond in a day or two.

Side note: Posteo does not allow own domains (you can only choose from the list of Posteo.* domains that the company owns). The reason for that is mentioned in their FAQ (in short, the company doesn’t want to have or store customer identifying information wherever possible).

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