We need lookup and read, only lookup is not enough.
Please execute
doveadm acl set -A Public authenticated lookup read
to set the needed permissions.
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I tested now and it worked with real domainname (and letsencrypt) instead of localhost and in the mail address part (instead of .lan). Maybe the NC mail app validates the mail addresses and servers.
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OK, thank you Markus!
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A post was split to a new topic: Special Mail Folders at Nextcloud