This is the mail system at host mail.zapf.in.
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The mail system
<bastian.schomberg(a)gmx.de>: host mx00.emig.gmx.net[212.227.15.9] said:
552-Requested mail action aborted: exceeded storage allocation 552-Quota
exceeded. 552 For explanation visit
https://postmaster.gmx.net/en/error-messages?ip=94.130.65.175&c=quot (in
reply to RCPT TO command)