Posteo
From Mailbox.org's T&C:
"When you register on our internet pages, the IP address assigned by your internet service provider (ISP) as well as the date and time of the registration are stored. This data is stored because this is the only way to prevent misuse of our services and, if necessary, to enable us to investigate criminal offences committed. [...] This data will fundamentally not be shared with third parties unless required by law or for the purpose of criminal prosecution."
"...or present a judicial warrant that asks for the release of mailbox contents and data logs, or order the surveillance of the user's telecommunications data."
the storage or the dispatch of pornographic material as defined in Sections 184-184c of the German Criminal Code (StGB) or of media listed in Section 24 Paragraph 1 of the Youth Protection Act (JuSchG) as being harmful to minors.
the storage or the dispatch of image, video, audio, text or other files in contravention of copyrights, trademark rights, name rights, competition rights or personal rights or of files which contain prohibited propaganda material or designators of unconstitutional organisations (Sections 86 and 86a of the German Criminal Code [StGB]).
AlanZ the storage or the dispatch of pornographic material as defined in Sections 184-184c of the German Criminal Code (StGB) or of media listed in Section 24 Paragraph 1 of the Youth Protection Act (JuSchG) as being harmful to minors.
the storage or the dispatch of image, video, audio, text or other files in contravention of copyrights, trademark rights, name rights, competition rights or personal rights or of files which contain prohibited propaganda material or designators of unconstitutional organisations (Sections 86 and 86a of the German Criminal Code [StGB]).
Wow, so they do read your mails in other words.
Just be happy that they didn't mention par. 188 StGB yet (Criticism of politicians is verboten, and yes they actually send the police to your house for calling MPs "dumb" or "fat")