How many team members can you have with basic account?

[Moe Stewart]

There are only 6 members in my team and we have a very basic workflow so I am using the free basic account.  I sent an email to invite one member with a gmail account and it went through.  I tried to invite a second member with a yahoo account and it said it couldn't be sent.  Am I limited to the number of people or do they have to have gmail accounts to participate?

[Andrea Crawford]

I don't believe there's a limit on the number of members you can add. Does the Yahoo account holder already have a Trello account? Are you trying to invite them to a board or to a Workspace? Could you share a picture of the message you're seeing that says it can't be sent?