Note: lost mails: I became aware that some (many?) mails sent to me/by me have been lost. In case you miss an answer, resend your mails please (or send a regular mail letter, or call me or our secretary by phone).

• mails wrongly marked as SPAM by overly critical spam traps (sometimes the mail is marked and delivered, sometimes, it is just removed without any notice).
  This occurs mainly in two cases:
  • mails sent via google or hotmail etc. Especially this happened to questions and enquiries from foreign students using mail servers/addresses in countries that are known as global spam sources.
  • mails sent via mailing lists (e.g. dbworld) or conference management systems (easyChair, MS-cmt, ...). The latter is a common problem that also concerns people at other universities (after my experiences as PC co-chair of ESWC 2007 with a fairly large PC; I estimate about 5-10% of all scientists).
• The university's computers are used for sending spam mails. Thus, other mail servers block mails coming from the university's mail server.
  Sometimes, we (as senders) are informed that our mails are not delivered, but usually, mails disappear without notification.
  See e.g. here for an official statement of our computing center.
• I assume that there are further problems when accessing the mail through the institute's and the GWDG infrastructure. Up to now, it has not been possible to trace these problems. There seem to be problems with the detection of the size of mails in the IMAP servers