Cyren is planning a series of upgrades to their Threat Intelligence Anti-Spam databases for the following dates and times:

Sunday, April 21st, 07:00 - 07:30 UTC

Sunday, May 5th, 07:00 - 08:00 UTC

Sunday, May 17th, 07:00 - 08:00 UTC

According to Cyren, the only services affected will be false negative and false positive reporting, which will simply be delayed until the end of reach maintenance window. On these dates, or anytime for that matter, you can check the Cyren status by going to: https://status.cyren.com