We will periodically post undocumented features and easter eggs to the Server Notices page. They will be collected here:

Apr 2, 2025

Did you know that we have always supported automatically expiring aliases on any catch-all domain? If you enter an alias in the format of YYYYMMDD@any one of your choosen catch-all domains, that alias will accept mail up until that date (not including it, so last day mail is accepted is day before this date) and then it will forever reject as User Unknown. Just another one of the semi-hidden features of this service for when you need a temporary address just for a specific amount of time.

We have been offering this feature for 25 years and carried it over to CodaMail. We still see rejections for dates like 20010322 to this day.

Mar 14, 2025

Did you notice that circle picture in the email when you read it? Did you know that is a unique cryptographic hash for that sender?

If you pay attention to it, you'll be able to tell our mails from fakes just by the picture.