Activity mail alias not working with more than 50 signups

[wilco375]

How to reproduce

1. Create an activity with a signup list
2. Have more than 50 participants
3. Create a new mail alias

Expected behaviour

Mail alias is created

Current behaviour

ImprovMX returns: Improvmx::BadRequestError: 400 Bad Request {"forward"=>["You can only add up to 50 destinations. If you need more, please contact us."]}

Possible solutions

There is not really a clean solution for this limitation I think. Two possible solutions I see:

1. Create a mail alias for each group of 50 participants and display the multiple aliases to the user
2. Create a mail alias for each group of 50 participants, and then create an additional alias that has the other aliases as the recipients

[lodewiges]

I think This issue is solved, because the limit is increased to 100 people which is unlikely to be surpassed on a activity, otherwise you could force moderation on mailadres with more than 100 people