Limitations on creating email aliases?

Ma a posé une question...
Hi all,
In the past I used to create alias in the form of xxx.yyy@riseup.net. Today, I wanted to create a new one and it said alias was invalid. After using a dash in the address it worked. Are there some new limitations on the creation of aliases? If yes, what are those limitations.
Thanks for any tips!

P.S. I'm sure that the alias is not already taken, as I tried various combinations.
Vote | 1
Cyanolyca turcosa ecua4944
Urraca De Cuello Negro a répondu...
closing this in favor of #6069
Vote | 0